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Tytuł:
A new Middle Devonian heterocoral from Spain
Autorzy:
Fernandez-Martinez, E
Tourneur, F.
Lopez-Alcantara, A.
Tematy:
Cantabrian Zone
Heterocorallia
Eifelian
Devonian
heterocoral
Middle Devonian
paleontology
Spain
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/21951.pdf  Link otwiera się w nowym oknie
Opis:
Most of the heterocorals described up to now from strata older than Famennian are of doubtful affinities. Numerous specimens of the new genus and new species here described were collected during a sedimentological study of the Santa Lucía Formation in La Pola de Gordon (León province, Cantabrian Mountains, NW Spain). Stellaphyllia luciensis gen. et sp. nov. is characterized by cylindrical coralla, with a diameter of less than 2 mm and more than 2 cm long, having stellate to more or less rounded outer profile. Four to six septa, less frequently seven, are cojoined axially by a short oblique septum. The few tabulae present are steeply arched. The microstructure of the septa and interseptal elements shows thin elongate microlamellae parallel to a median plate which is granular in appearance. The new genus dated to the lower Eifelian age could be important in understanding the early phylogeny and origin of the order Heterocorallia.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soft-tissue attachments in orthocerid and bactritid cephalopods from the Early and Middle Devonian of Germany and Morocco
Autorzy:
Kroger, B
Klug, C.
Mapes, R.
Tematy:
Cephalopoda
Germany
Orthocerida
Emsian
Morocco
Middle Devonian
soft tissue attachment
Early Devonian
Bactritida
muscle scar
Eifelian
Devonian
cephalopod
paleontology
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/20326.pdf  Link otwiera się w nowym oknie
Opis:
In the Early to Middle Devonian shale sequences of Germany and Morocco, pyritised and secondarily limonitised cephalopod remains are common. Details of the soft−tissue attachment structures are sometimes preserved on the internal moulds of the body chamber and phragmocone of these cephalopods. Some of the studied Orthocerida show a very faint annular elevation and a dorsal furrow. A few Bactritida show a distinctive annular elevation with two circular bands. The bands form a paired or threefold lobe at the dorsum of the shell. Morphological differences between Orthocerida and Bactritida suggest different soft part morphologies. A comparison of the attachment scars shows that the Bactritida are intermediate between the Orthocerida and ammonoids with regard to their muscle attachment scars. The shape of the muscle scars are interpreted as indication for a planktonic lifestyle in Orthocerida and a comparatively active, nektonic lifestyle in Bactritida and ammonoids. The new genus Acanthomichelinoceras is erected. Acanthomichelinoceras commutatum, Cycloceras sp., Bactrites gracile, Bactrites sp. A, Bactrites sp. B, and Bactrites sp. C are described.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lindstroemiidae and Amplexocariniidae (Tetracoralla) from the Middle Devonian of Skaly, Holy Cross Mountains, Poland
Lindstroemiidae and Amplexocariniidae (Tetracoralla) z środkowego dewonu Skał (Góry Świętokrzyskie)
Lindstroemiidae and Amplexocariniidae (Tetracoralla) iz srednego devona mestnosti Skaly (Sventokrzhiskie Gory, Polsha)
Autorzy:
Fedorowski, J.
Tematy:
Lindstroemiidae
Amplexocariniidae
Tetracoralla
brachiopod
Middle Devonian
Devonian
paleontology
Holy Cross Mountains
Polska
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/22039.pdf  Link otwiera się w nowym oknie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new giant discinoid brachiopod from the Lower Devonian of Algeria
Autorzy:
Mergl, M
Massa, D.
Tematy:
systematics
new brachiopod
brachiopod
Devonian
Algeria
Lower Devonian
Germany
Discinoidea
Brachiopoda
paleontology
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/22683.pdf  Link otwiera się w nowym oknie
Opis:
A new discinoid brachiopod Gigadiscina gen. nov., with the type species G. lessardi sp. nov., is described from the Lower Devonian (Siegenian) of the Tamesna Basin (South Ahaggar Massif, South Algeria). It is characterised by large size and convexo−planar profile of the shell, with a subcentral pedicle foramen. Micro−ornament is typically discinoid, with small circular pits in radial rows on the post−larval shell surface. Related species of Malvinokaffric Realm origin from South Africa, Falkland Islands, Antarctica, South America, and Libya are reviewed, including the poorly known Discina anomala from the Lower Devonian of Germany. The giant size and convexo−planar shells of these discinoids, remarkably similar to recent limpets, are interpreted as adaptation to a habitat in proximity of sandy and gravel beaches in a high−energy environment. Most likely, the conical dorsal valve suppressed drag in turbulent waters, whereas fixation of shell by large, sucker−like pedicle eliminated peeling from the substrate.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Middle Devonian Foraminifera from the Holy Cross Mountains
Autorzy:
Gajewska, Maria
Tematy:
foraminifera
Devonian
systematics
palaeobiogeography
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/2177468.pdf  Link otwiera się w nowym oknie
Opis:
The Middle Devonian was an exceptional time for foraminiferal evolution because of the emergence of the first true calcareous multilocular taxa. Despite being key forms for an understanding of the origin of foraminiferal multilocularity, which is one of the most intriguing events in the evolutionary history of the group, they are largely unstudied. These unique foraminifera, including representatives of the genera Cremsia, Moravammina, Pseudopalmula, Semitextularia, and Vasicekia, are presented herein as well as foraminifer-like microfossils of uncertain biological position. The studied material comes from the Middle Givetian strata of the Miłoszów section and the Eifelian part of the Grzegorzowice-Skały section (Holy Cross Mountains, Poland). Described isolated specimens are in an exceptionally good state of preservation on a worldwide scale, which enabled the detailed analysis of test morphologies, complementing previous papers based on less well-preserved material. The suggested systematics of the foraminifera collected attempts to revise scarce taxonomic data that is still under debate, especially the classification of Moravammina, Cremsia, and Vasicekia. The Devonian foraminifers presented were prominent endobenthic and epibenthic inhabitants of common organic coral-stromatoporoid buildups. Palaeobiogeographical records show that during the Middle Devonian, the studied forms extended their exclusive European distribution into further Laurussian shelves and shallow seas, located in the northern and southeastern parts of the Rheic basin. This assumes that such assemblages may be used as palaeoenvironmental indicators. However, at present, their correlative potential is unknown.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Palynology and microfacies of Lower Devonian mixed carbonate-siliciclastic deposits in Podolia, Ukraine
Autorzy:
Filipiak, P.
Zaton, M.
Szaniawski, H.
Wrona, R.
Racki, G.
Tematy:
palynology
microfacies
Lower Devonian
Devonian
carbonate-siliciclastic deposit
Podolia
Ukraine
stratigraphy
cuticle
arthropod
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/19979.pdf  Link otwiera się w nowym oknie
Opis:
Investigation of mixed carbonate−siliciclastic Lower Devonian deposits have been carried out in the Ivanye Zolote and Ustechko sections in Podolia, Ukraine. Based on palynomorph evidence, the age of the samples studied is late Lochkovian, not older than the NM Oppel Miospore Zone, specifically the Si Lineage Zone. The presence of acritarchs and chitinozoans points to dominantly marine depositional conditions. However, a regressive environmental change toward more brackish conditions is indicated by a decrease in the taxonomic diversity of acritarchs in the topmost samples, the simultaneous disappearance of chitinozoans, and an increase in leiosphaerid frequency. Furthermore, evolution of limestone microfacies demonstrates a progressive transition from a shrinking marine basin toward a brackish, storm−affected muddy lagoon, manifested by recurrent profusion of impoverished, mostly opportunistic and euryhaline shelly benthos (nuculanid bivalves, leperditicopids and other ostracods, terebratulid brachiopods), chaetetid demosponges and diverse ichthyofauna. The association of plant (mainly nematophytes and some tracheids) and animal (eurypterid, ?scorpion, and possibly other arthropod) remains points to the presence of nearby Early Devonian wetland vegetation, providing food and shelter for various semi−aquatic and other terrestrial arthropods.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acanthodian jaw bones from Lower Devonian marine deposits of Podolia, Ukraine
Autorzy:
Voichyshyn, V.
Szaniawski, H.
Tematy:
acanthodian jaw
jaw bone
Lower Devonian
Devonian
marine deposit
Podolia
Ukraine
Acanthodii
Ischnacanthiformes
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/22218.pdf  Link otwiera się w nowym oknie
Opis:
Ischnacanthiform acanthodian dentigerous jaw bones from the Lower Devonian (Late Lochkovian) of Podolia are described for the first time. One new genus and one new species are established. Podoliacanthus gen. nov. is diagnosed as having small−sized jaw bones, the presence of specific accessory cusps/denticles on the medial side of teeth of the lateral tooth row, and groups of denticles forming the lingual tooth row. Podoliacanthus zychisp. nov. is distinguished in having elongated slender jaw bones and lateral teeth with one medial side denticle. Besides, three species are described in open nomenclature: Podoliacanthus sp. 1, while similar to Podoliacanthus zychi sp. nov., differs in having stronger posterior inclination of the teeth tips and presence of well developed flanges of the teeth, P. sp. 2 has quite robust jaw bones and teeth with two medial side denticles, and Podoliacanthus sp. 3 has small narrow jaw bones and teeth with three medial side denticles. Morphology of the lingual tooth row is considered to be a diagnostic feature of generic and higher taxonomic levels, while accessory medial cusps/denticles of the teeth are regarded as diagnostic features at species level. The new genus also occurs in Upper Silurian or Lower Devonian deposits of North Greenland. Preservation of the jaw bones possibly depends on their secondary mineralization.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Middle Palaeozoic chondrichthyans and the associated ichthyofauna from southern Poland : a review
Autorzy:
Ginter, Michał
Wilk, Olga
Tematy:
Chondrichthyes
Osteichthyes
Devonian
Carboniferous
Polska
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/1835970.pdf  Link otwiera się w nowym oknie
Opis:
During the last sixty years, large collections of ichthyofauna, mainly isolated, microscopic, skeletal remains (ichthyoliths), from the Middle–Upper Devonian and Lower Carboniferous rocks of southern Poland have accumulated in the hands of Polish palaeontologists and in palaeontological institutions. Some parts of these collections were described in unpublished dissertations and others were published in dispersed papers, dealing mostly with selected regions or taxa. This review summarises the available data from the following regions: the Holy Cross Mountains, the Cracow Upland, the Sudetes and the Lublin Coal Basin (in the latter two cases, single localities). Altogether, 29 chondrichthyan species were identified and a few more still require classification. Of the Sarcopterygii, three species of onychodontiforms and one of the actinistians were found, in addition to a collection of dipnoans that was described much earlier. A few morphological types were distinguished among actinopterygian scales; otherwise the actinopterygian fossils are not referred to any lower-level taxon, and the same applies to the acanthodians. There were several attempts in the past to apply Polish ichthyoliths in biostratigraphy and palaeoecology, but after all these years, it appears that such propositions have only limited significance.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New osteostracans from the Lower Devonian terrigenous deposits of Podolia, Ukraine
Autorzy:
Voichyshyn, V
Tematy:
Ukraine
new osteostracan
Agnatha
osteostracan
Devonian
Lower Devonian
morphology
deposit
Podolia
taxonomy
paleontology
Osteostraci
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/20783.pdf  Link otwiera się w nowym oknie
Opis:
New osteostracans (Agnatha, Osteostraci) Zenaspis dzieduszyckii sp. nov. and Wladysagitta janvieri gen. et sp. nov., as well as new form of Diademaspis are described from the Lower Devonian of Podolia (Ukraine). Among them Zenaspis dzieduszyckiisp. nov. differs from all other representatives of the genus by its smaller overall size and relatively larger orbits. Wladysagitta janvieri is remarkable by having a rostral process. This new species together with “Cephalaspis” acutirostris Stensiö, 1932 from Old Red deposits of Shropshire (Great Britain) are proposed to be united under common generic name Wladysagitta. Since Diademaspis sp. is completely unknown in outline of its shield, it could not be named as new species, although it should be a really new form. New diagnostic features, such as relative width of the orbits, relative width of the dorsal field, and the position of the posterior end of the lateral fields relatively to the margins of the headshield, are proposed to differentiate genera within the Zenaspididae. Probably, the rostral process of osteostracans should be considered as a multifunctional device having at least a sensory function for food−search, possibly hydrodynamic functions, or may play a role in scaring predators.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conodont-based graphic correlation of upper Givetian-Frasnian sections of the Eastern Anti-Atlas (Morocco)
Autorzy:
Gouwy, S.
Haydukiewicz, J.
Bultynck, P.
Tematy:
Morocco
Devonian
conodonts
graphic correlation
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059507.pdf  Link otwiera się w nowym oknie
Opis:
A high-resolution correlation of ten upper Givetian-Frasnian sections spread over the differ ent facies environments of the Eastern Anti-Atlas (Morocco) is established using graphic correlation. The mea sured strati graphic ranges of eighty-five cono dont taxa have been as sem bled into a chronostratigraphic framework. The developed regional composite subdivides the Frasnian into 501 composite standard units (CSU) based on the original thickness of the reference section (Bou Tchrafine). This is a higher resolution than obtained by the classic biozone correlation. Based on the conodont data available for this correlation project, the jamieae and Lower rhenana zones could not be recognised in the sections.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-snail infestation of Devonian crinoids and the nature of platyceratid-crinoid interactions
Autorzy:
Baumiller, T K
Tematy:
USA
Silica Formation
Devonian
platyceratid-crinoid interaction
biotic interaction
crinoid
snail
Middle Devonian
paleontology
Ohio
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/20265.pdf  Link otwiera się w nowym oknie
Opis:
The well−known association of platyceratid snails and crinoids typically involves a single snail positioned on the tegmen of the crinoid host; this has led to the inference of coprophagy. Two specimens of the camerate crinoid Arthroacantha from the Middle Devonian Silica Formation of Ohio, USA, exhibit numerous snails on their tegmens. On one of these, 6 platyceratid juveniles of approximately equal size are found on the tegmen. On the second crinoid, the largest of 7 infesting platyceratids occupies the typical position over the anal vent while others are either superposed (tiered) upon it or are positioned elsewhere on the tegmen. These specimens illustrate that platyceratids (1) settled on crinoids as spat, (2) were not strictly coprophagous during life yet (3) benefited from a position over the anal vent.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Organic remains of tentaculitids: New evidence from Upper Devonian of Poland
Autorzy:
Filipiak, P
Jarzynka, A.
Tematy:
Dacryoconarida
Upper Devonian
Polska
paleontology
remains
Frasnian
Tentaculita
tentaculitid
Devonian
organic remains
West Pomeranian region
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/21723.pdf  Link otwiera się w nowym oknie
Opis:
Organic remains of tentaculitids have been recovered during palynological research on archival samples from the Dobrzyca 2 borehole (Western Pomerania). Until now tentaculitids are widely known from their abundant mineralised shells. As organic remains, on the other hand, they have only been known since 2004. The present discovery is currently the second one of this kind found in Upper Devonian strata. The shape and morphology of some recognized tentaculitid organic remains are similar to embryonic and juvenile forms of dacryoconarids belonging to orders Nowakiida and Stylionida. Based on palynomorphs, the age of the two samples investigated has been established as Frasnian, RB and RD local miospore zones.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Colour patterns in Early Devonian cephalopods from the Barrandian Area: Taphonomy and taxonomy
Autorzy:
Turek, V
Tematy:
colour pattern
Early Devonian
Devonian
cephalopod
Barrandian area
taphonomy
taxonomy
Bohemia
paleontology
Cephalopoda
Nautiloidea
fossil
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/21864.pdf  Link otwiera się w nowym oknie
Opis:
Five cephalopod specimens from the Lower Devonian of Bohemia (Czech Republic) preserve colour patterns. They include two taxonomically undeterminable orthoceratoids and three oncocerid nautiloids assigned to the genus Ptenoceras. The two fragments of orthocone cephalopods from the lowest Devonian strata (Lochkovian, Monograptus uniformis Zone) display colour patterns unusual in orthoceratoids. They have irregular undulating and zigzag strips that are preserved on counterparts of adapertural regions of specimens flattened in shale, despite their original aragonitic shell having been completely dissolved. These are probably the result of the proteinous pigment inside the shell wall, being substituted during diagenesis by secondary minerals leaving only an altered trace of the original shell. Orthoceratoids from sediments unsuitable for preservation of this feature discussed here thus demonstrate an exceptional case of preservation of colour patterns, not only within Devonian cephalopods but also within other Devonian molluscs. Three specimens of Ptenoceras that preserve colour patterns come from younger Lower Devonian strata. Oblique spiral adaperturally bifurcating bands are preserved in P. alatum from the Pragian and zigzags in P. nudum from the Dalejan. Juvenile specimen of Ptenoceras? sp. from the Pragian exhibits highly undulating transversal bands—a pattern resembling colour markings in some Silurian oncocerids. Dark grey wavy lines observed on the superficially abraded adapical part of a phragmocone of nautiloid Pseudorutoceras bolli and interpreted formerly to be colour markings are here reinterpreted as secondary pigmented growth lines. Other Devonian fossils including a single brachiopod and several gastropods from the Barrandian Area with preserved colour patterns are mentioned. Variety of cephalopod colour patterns, their taxonomic significance, function and significance for palaeoecological interpretation, palaeoenvironmental conditions favouring colour pattern preservation and systematic affiliation of taxa with colour pattern preserved are discussed.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sublethal injuries in Early Devonian cephalopod shells from Morocco
Autorzy:
Klug, C.
Tematy:
Ammonoidea
Bactritoidea
Devonian
Early Devonian
Gnathostomata
Morocco
cephalopod
paleontology
shell
predation
life mode
ectocochleate cephalopod
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/22322.pdf  Link otwiera się w nowym oknie
Opis:
Internal moulds of the relatively small− to moderate−size shells of Early Devonian ectocochleate cephalopods (typically <150 mm diameter) occasionally display traces of repaired shell damage. Presumably, these animals with their highly specialized buoyancy device, the phragmocone, lived in the water column. It is uncertain as to how the shells of these animals were damaged; one likely cause would be predatory attacks but the identity of the perpetrator remains uncertain. So far, no remains of arthropods capable of breaking or cutting shells have been found in the fossiliferous outcrops of this age in the Anti−Atlas (Morocco). The only macrovertebrate remains of this age are of acanthodian and placoderm fish which probably lived a more or less benthonic life style. Additionally, a fish attack on these cephalopods would probably have destroyed most of the thin−shelled conch and killed the animal. Most of the repaired shell breaks are triangular in shape which is characteristic for cephalopod bite marks. Additionally, the paired arrangement of the fractures in over 70 bactritoids supports the hypothesis that it was a cephalopod attacking another cephalopod. It cannot be excluded with certainty that occasional vertebrate attacks left traces on their shells. Fossil evidence indicates that the development of tightly coiled conchs was a rapid evolutionary event in the Ammonoidea in the Early Devonian; however, the evolution of coiling is probably not directly related to predation pressures because the ratio of injured to healthy specimens is roughly the same in Zlíchovian bactritoids with orthoconic and ammonoids with coiled shells.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revision of latest Givetian-Frasnian Atrypida [Brachiopoda] from central North America
Autorzy:
Day, J
Copper, P
Tematy:
Late Frasnian
fauna
brachiopod fauna
Frasnian
Late Devonian
Devonian
Atrypida
taxonomy
North America
Givetian
Brachiopoda
paleontology
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/20627.pdf  Link otwiera się w nowym oknie
Opis:
The brachiopod fauna of the Middle-Late Devonian cratonic carbonate platform deposits of the Iowa Basin, central North America, contains twenty species of the order Atrypida, some of which are types for widespread genera common in Middle and Late Devonian faunas. The latest Givetian-early Frasnian deposits yield a diverse fauna consisting of ten species (two new) included in Desquamatia (Independatrypa), D. (Seratrypa), Pseudoatrypa, Radiatrypa, Spinatrypa (Spinatrypa) and Spinatrypina (Exatrypa). Many of these forms occur in, or are closely similar to species known from, coeval faunas of central and western Canada. Middle Frasnian deposits of northern Iowa contain two species included in Spinatrypa (S.) and Pseudoatrypa, both of which are new. Late Frasnian strata of the Iowa Basin yield eight species included in Costatrypa, Iowatrypa, Pseudoatrypa, and Spinatrypa (Spinatrypa), some of which are widespread in other subtropical and tropical faunas of the western US and western Canada. The taxa Pseudoatrypa witzkei sp. n., Spinatrypa (S.) bunkeri sp. n., Spinatrypa (S.) thompsoni sp. n., and Spinatrypina (Exatrypa) johnsoni sp. n. are proposed. Pseudoatrypa? sp. from the very late Frasnian of southern New Mexico is also illustrated.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biernatella - a new Devonian double-spired brachiopod
Biernatella - nowy dewoński ramienionóg z diplospiralium
Biernatella – novyjj devonskijj brakhiopod s diplospiralium
Autorzy:
Balinski, A.
Tematy:
paleontology
Biernatella
Biernatella polonica
new species
Devonian
Upper Devonian
Biernatellidae
Dayioidea
double-spired brachiopod
brachiopod
Polska
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/22625.pdf  Link otwiera się w nowym oknie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anhydrite and gypsum in the Devonian and Permian evaporite lithofacies of Belarus : a review
Autorzy:
Makhnach, A.
Shimanovich, V.
Streltsova, G.
Mikhajlov, N.
Tematy:
anhydrite
gypsum
evaporites
Devonian
Permian
Belarus
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2060068.pdf  Link otwiera się w nowym oknie
Opis:
Anhydrite is widespread in the Prypiać Trough in the form of beds and nodules in the Subsaliferous Terrigenous and Carbonate formations (Eifelian and Frasnian), the Lower Saliferous Formation (Frasnian), the Intersaliferous and Upper Saliferous formations (Famennian). It is also present in the Asselian and Sakmarian (Lower Permian) deposits of the trough. The anhydrite is grey, blue, pink and orange. It has massive and, more rarely, horizontal bedding, and a fine- and micro-crystalline structure. Gypsum extends widely across the Orša Depression, Žlobin and Latvijas Saddles and partly in the Belarusian Anteclise, where it lies within the Eifelian deposits. It is also found in the Frasnian strata of the North-Prypiać Shoulder. As a component of facial analogue of the Upper Saliferous Formation gypsum forms the Bryniou deposit in the west of the Prypiać Trough. This mineral is also observed in the Oversaliferous Formation (Famennian) and in the Asselian and Sakmarian strata of the trough. There are spar, saccharoidal, alabastrine and selenitic varieties of gypsum. A medium to coarse crystalline structure is typical. The gypsum is grey, pink, yellow or orange.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Givetian and early Frasnian cono donts from the Compte section (Middle-Upper Devonian, Spanish Central Pyrenees)
Autorzy:
Liao, J.-C.
Valenzuela-Ríos, J. I.
Tematy:
Devonian
Spanish Pyrenees
conodonts
correlation
biostratigraphy
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2060201.pdf  Link otwiera się w nowym oknie
Opis:
The Givetian and Frasnian conodont suc cession investigated in the Compte section (Spanish Pyrenees) is subdivided into nine Givetian standard conodont zones and two Frasnian zones (MN zones). This succession allows precise identifcation of the lower/middle Givetian, middle/upper Givetian and of the Givetian-Frasnian boundaries by means of index conodonts. The joint entry of Mesotaxis falsiovalis and Skeletognathus norrisi in the same bed shows local isochroneity of the beginning of the falsiovalis and norrisi zones in the latest Givetian. In the earliest Frasnian the sequence of Ancyrodella pristina, A. soluta and A. rotundiloba is observed whilst A. binodosa is lacking. The conodont assemblages consist of key species of the following nine genera: Polygnathus, Icriodus, Tortodus, "Ozarkodina", Schmidtognathus, Klapperina, Mesotaxis, Skeletognathus and Ancyrodella. This is the first conodont report from the Pyrenees showing such a detailed succession of enormous correlation potential.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Middle Devonian brachiopods from northern Maïder (eastern Anti-Atlas, Morocco)
Autorzy:
Halamski, Adam T.
Baliński, Andrzej
Koppka, Jens
Tematy:
systematics
Brachiopoda
Morocco
Devonian
Eifelian
Givetian
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/2133938.pdf  Link otwiera się w nowym oknie
Opis:
Sixty brachiopod species are reported from the Taboumakhlouf Formation (upper Eifelian) and the Bou Dib Formation (upper Eifelian to Givetian) of Jbel Issoumour, northern Maïder, Anti-Atlas, Morocco, on the basis of collections made by Volker Ebbighausen. The stratigraphy is based on reports of co-occurring trilobite assemblages. The relatively diversified fauna pre-dates the Taghanic event and is dominated in terms of diversity by atrypides and rhynchonellides (11 species each); other frequent species include Poloniproductus varians, Aulacella prisca, Tyersella tetragona, Schizophoria schnuri, Athyris ex gr. concentrica, Yeothyris? sinuata, and Thomasaria simplex. Spinatrypa ennigaldinannae Halamski and Baliński sp. nov. from the upper Eifelian is characterised by a transverse shell, typically 16–18 mm wide with 19–22 ribs. Prodavidsonia ebbigahuseni Halamski and Baliński sp. nov. differs from other representatives of the genus in having nearly flat shells. Eressella coronata Halamski and Baliński, nom. nov. is proposed as a replacement name for the permanently invalid Rhynchonella coronata Kayser, 1871 (non R. coronata Moore, 1861). Thomasaria simplex is documented as being a particularly variable species (costation, tongue, interarea position), so its broad taxonomic treatment is favoured. The brachiopod fauna shows distinct Rhenish affinities (numerous species in common with the Eifel and the Holy Cross Mountains) like the coeval fauna from southern Maïder, described previously. The Middle Devonian brachiopod fauna from the whole Maïder (north, described here and south, described previously) totals 87 species.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Life strategies and function of dissepiments in rugose coral Catactotoechus instabilis from the Lower Devonian of Morocco
Autorzy:
Berkowski, B.
Tematy:
life strategy
life function
dissepiment
rugose coral
Catactotoechus instabilis
paleontology
Devonian
Lower Devonian
Morocco
Rugosa
coral
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/20490.pdf  Link otwiera się w nowym oknie
Opis:
This study focuses on the life strategies of small, dissepimented rugose coral Catactotoechus instabilis (representative of Cyathaxonia fauna) from the Emsian argillaceous deposits of mud mounds of Hamar Laghdad (Anti−Atlas, Morocco). Numerous constrictions and rejuvenescence phenomena as well as frequent deflections of growth directions among the studied specimens suggest unfavourable bottom conditions resulted from sliding down of the soft sediment on the mound slopes. Dissepimental structures observed on well−preserved calices and thin sections played an important role in the life of the coral, supporting their successful recovery after temporary burial within unstable soft sediment. The development of lonsdaleoid dissepiments, apart from being biologically controlled, was also strongly influenced by environmental factors. Such modifications in lonsdaleoid dissepiments growth were observed in phases of constrictions, rejuvenescence and deflections of growth, when their development was significantly increased in comparison to phases of their stable growth. Dissepiment morphology suggests that the process of formation of lonsdaleoid dissepiments in Catactotoechus instabilis is consistent with the hydraulic model.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exceptional soft-tissue preservation in boring ctenostome bryozoans and associated “fungal” borings from the Early Devonian of Podolia, Ukraine
Autorzy:
Olempska, E.
Tematy:
soft tissue preservation
ctenostome bryozoan
bryozoan
Early Devonian
Devonian
paleontology
Podolia
Ukraine
Bryozoa
fungi
demineralization
phosphatization
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/21117.pdf  Link otwiera się w nowym oknie
Opis:
Colonies of boring ctenostome bryozoans and microborings of “fungi” that occur in the Early Devonian (Lochkovian, ~416 Ma) of Podolia, western Ukraine, have soft−tissue preserved by phosphatization. These comprise exceptional three−dimensional body walls of feeding zooids with probable parietal muscles inserted on the cystid wall, and setigerous collars twisted within the vestibulum. The presence of collars in this Early Devonian ctenostomes proves the existence of this feature for more than 416 Ma of ctenostome evolution. Phosphatized remains of the zooid walls are interpreted as relicts of the originally chitinous cystid walls. This is the first record of soft−tissue fossilization in a boring bryozoan. The presence of cavities (specialized heterozooids), empty or filled with laminated calcium phosphate, is also documented in bryozoans for the first time. These cavities are interpreted as “store−rooms” in which the bryozoans accumulated nutrients. The new taxon, Podoliapora doroshevi gen. et sp. nov. is described. In additional, phosphatised fungi−like endoliths co−occur with bryozoans.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mesozoic remagnetization of Upper Devonian carbonates from the Česis and Skaistgirys quarries (Baltic states)
Autorzy:
Katinas, V.
Nawrocki, J.
Tematy:
Lithuania
Latvia
Devonian
palaeomagnetism
remagnetisation
dolomites
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2058838.pdf  Link otwiera się w nowym oknie
Opis:
The palaeomagnetic properties of Frasnian and Famennian dolomites from two quarries in Latvia and Lithuania respectively are compared. Famennian dolomites from Skaistgirys quarry (N Lithuania) revealed the presence of one distinct normal polarity component (D =14 degrees Celsius, I = 53 degrees Celsius, 95 = 4.2 degrees Celsius, n = 28 specimens). The reversed polarity component predominates in Frasnian dolomites from Česis quarry (Central Latvia). Only one hand specimen from this locality contained a component with the opposite direction. The mean direction from Česis quarry (D = 198 degrees Celsius, I = -53 degrees Celsius, 95 = 4.4 degrees Celsius, n = 22 specimens) is very close to that from Skaistgirys quarry and therefore was recorded most probably during the same event of remagnetisation but at a later stage. The remagnetizations of these dolomites were caused most probably by progressive oxidation of ferric sulphides to magnetite and finaly to hematite. A comparison of the palaeomagnetic poles obtained with the stable European APWP (Apparent Polar Wander Path) indicates a Late Jurassic/Early Cretaceous age for the remagnetization event. This estimation can be useful for chronostratigraphic linking of post-Palaeozoic tectonic activity and diagenetic events, so far very poorly recognized in this part of the European plate. Our data shows also that the Late Jurassic/Early Cretaceous part of the stable European APWP may still be inaccurate.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth in early species of the conodont Ancyrodella and implications for correlation of the Middle-Upper Devonian boundary
Autorzy:
Miller, C.G.
Tematy:
conodonts
Devonian
Givetian
Frasnian
Ancyrodella
ontogeny
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059511.pdf  Link otwiera się w nowym oknie
Opis:
The first occurrence of the conodont Ancyrodella rotundiloba has been used extensively for correlating the Middle-Up per Devonian (Givetian-Frasnian) boundary in sections worldwide despite many arguments as to its precise taxonomic definition. These arguments are summarised herein and three ontogenetic series illustrated from three samples across the Givetian-Frasnian boundary within the Vorota Formation of the Kozhym River section, Sub-Polar Urals, Russia. General trends within the three ontogenetic series suggest that the ratio of basal pit width to platform width in Ancyrodella pristina, and Ancyrodella recta in creases through ontogeny but the morphology of lateral secondary keel extensions to the basal pit remains constant and is a useful taxonomic feature. Folds and collars on the basal surface occur only in the later stages of development. The out line of the platform within species is variable and controlled by the formation of incipient nodes in juveniles; gerontic specimens can also have very variable platform out lines. Measure ments of platform width to basal pit width ratios and platform shape out lines may not therefore be a good way to compare between species. The three ontogenetic series provide typical late Givetian and early Frasnian examples and increase the potential for correlation of the Middle-Upper Devonian boundary particularly using juvenile Ancyrodella specimens.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genus Ammonicrinus (Crinoidea) from the Middle Devonian of the Holy Cross Mts (Poland)
Rodzaj Ammonicrinus (Crinoidea) ze środkowego dewonu Gór Świętokrzyskich (Polska)
Rod Ammonicrinus (Crinoidea) srednego devona Sventokrzhiskikh Gor (Pol’sha)
Autorzy:
Piotrowski, A.
Tematy:
Ammonicrinus
Ammonicrinus sulcatus
Ammonicrinus kongieli
evolutionary process
Crinoidea
crinoid
Middle Devonian
Devonian
paleontology
Holy Cross Mountains
Polska
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/22051.pdf  Link otwiera się w nowym oknie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lower Devonian [Emisian] rugose corals from the Cantabrian Mountains, Northern Spain
Autorzy:
Schroder, S
Soto, F.
Tematy:
ecology
Cantabriastraea cantabrica
Rugosa
Devonian
Lower Devonian
Tabulophyllum bonarense
rugose coral
Emsian
coral
paleontology
Spain
Cantabrian Mountains
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/21027.pdf  Link otwiera się w nowym oknie
Opis:
Two species of Lower Devonian rugose corals are described from the Cantabrian Mountains of Spain: Cantabriastraea cantabrica gen. et sp. nov. and Tabulophyllum bonarense sp. nov. The development of rootor buffer−like attachment structures (“rhizoid processes”) in T. bonarense indicates adaption to the soft substrate and supports corallite stabilisation. Because of their strongly everted calices and a corresponding arrangement of trabeculae, the colonies of the genus Cantabriastraea are assigned tentatively to the Paradisphyllinae, constituting the first record of the subfamily in Western Europe. Some specimens give information on colony−formation of this taxon, which is induced by strong lateral budding (nonparricidal increase) of a remarkable large and long−lasting protocorallite.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revision of the flexible crinoid genus Ammonicrinus and a new hypothesis on its life mode
Autorzy:
Bohaty, J.
Tematy:
flexible crinoid
crinoid
Ammonicrinus
new hypothesis
life mode
Crinoidea
Flexibilia
Devonian
Eifelian
Rhenish Massif
Germany
paleontology
Middle Devonian
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/20333.pdf  Link otwiera się w nowym oknie
Opis:
The lecanocrinid Ammonicrinus(Flexibilia) is newly interpreted based on new material from the Middle Devonian of the Rhenish Massif (Eifel and Bergisches Land, Germany). The species have echinoid−like tubercles on the attachment and on the column, which bear articulated spines. The intraspecific variability of the column is discussed for three facies−controlled morphotypes, herein classified as standard “exposed−” or “encased roller−type” and the rare “settler−type”. New specimens have floating transitions between different plate sculpturing and between those individuals with none or one to several columnals with herein termed “lateral columnal enclosure extensions” on the proximal−most, barrel−like dististele and the following mesistele, which is solely distinguished by these extensions. Based on this interpretation, Ammonicrinus kongieli is evaluated as a subjective junior synonym of Ammonicrinus sulcatus. The latter species was first recognised from the Eifel (Germany). “Ammonicrinus wachtbergensis”, from the upper Eifelian of the Eifel, is declared a subjective junior synonym of Ammonicrinus doliiformis. The first nearly complete specimen of Ammonicrinus kerdreoletensis is described from the lower Eifelian of Vireux−Molhain (southern Ardennes, France). Two new species are described: Ammonicrinus jankei sp. nov. and Ammonicrinus leunisseni sp. nov. A functional morphologic trend in perfecting the crown encasement by continuous modification of the lateral columnal enclosure extensions of the mesistele from the Eifelian to the Givetian, indicates a vagile benthic “predator”−driven evolution of ammonicrinids in the Eifel area. Several ammonicrinid species are herein defined as spined soft−bottom dwellers, feeding in low−intensity current water, possibly through a self−produced water flow. The first known postmortem encrusting epizoans on ammonicrinid endoskeletons are reported.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eressella, a new uncinuloid brachiopod genus from the Middle Devonian of Europe and Africa
Autorzy:
Halamski, A. T.
Baliński, A.
Tematy:
systematics
Brachiopoda
Rhynchonellida
Devonian
Germany
Polska
Morocco
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/191822.pdf  Link otwiera się w nowym oknie
Opis:
Eressella, a new genus of rhynchonellide brachiopods belonging to the superfamily Uncinuloidea Rzhonsnitskaya, 1956, is described with Rhynchonella coronata Kayser, 1871, as the type and only species. It is characterised by a dorsibiconvex profile with a resupinate ventral valve, costae rounded posteriorly, but acute and developing ventrally directed spur-like protuberances anteriorly, small dental cavities, cardinal process multilobed posteriorly and massive anteriorly, and the presence of a septalium and thick dorsal median septum. Given the present state of flux in the systematics of the superfamily, it is conventionally placed within the family Uncinulidae Rzhonsnitskaya, 1956, although similarities with the subfamily Betterbergiinae Savage, 1996 and the family Eucharitinidae Sartenaer, 2015 are also noted. Eressella coronata, hitherto the only representative of the genus, is known from the Eifel Hills (Eifelian, mainly middle Eifelian), from central Poland (especially from the Eifelian of the Holy Cross Mts.), and from the Moroccan Anti-Atlas (late Eifelian to early Givetian, details uncertain).
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Limitations on the application of the Devonian standard conodont zonation
Autorzy:
Bultynck, P.
Tematy:
Devonian
standard zonations
graphic correlation
composite standard
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059513.pdf  Link otwiera się w nowym oknie
Opis:
The most commonly used Lower and Middle Devonian conodont zonations that some times have been presented as standard zonations are evaluated. The author questions whether the Frasnian standard conodont zonation based on a phylogenetic succession of species belonging to the pelagicgenera Mesotaxis, Palmatolepis and Siphonodella can be used for world wide correlation. He fa vours the idea of an in ter national cono dont ref er ence scale based on a syn the sis of well established and documented conodont successions (with figured specimens of first and last occurrences of index-species) from key areas representing a variety of facies. Graphic correlation is likely to be the most objective and precise method to provide such a synthesis represented by the composite standard. Such standards have been allready elaborated for the Frasnian and the Middle Devonian. This point of view does not imply that classical biozonations should be abandoned.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Devonian/Carboniferous boundary in the Holy Cross Mountains
Autorzy:
Malec, J.
Tematy:
Holy Cross Mountains
Devonian
Carboniferous boundary
biostratigraphy
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059742.pdf  Link otwiera się w nowym oknie
Opis:
Five sections from the Kielce Region of the Holy Cross Mountains and one core from a borehole drilled in the nearby western Mesozoic Margin reveal the best recognized beds from the Devonian/Carboniferous boundary interval. In four sections: Ruda Strawczyńska, Bolechowice IG 1, Zaręby IG 2 and Kowala, the Devonian/Carboniferous boundary is located within a continuous series of deep-water carbonates, whereas in the two remaining: Ostrówka Quarry and the Jabłonna IG 1 borehole, the Devonian/Carboniferous boundary interval contains stratigraphic gaps resulting from lack of deposition in submarine conditions. The biostratigraphic position of the analyzed uppermost Devonian and lowermost Carboniferous beds is determined by assemblages of conodonts, microspores and deep-water ostracodes of the Thuringian ecotype. The lithology and biostratigraphic position of particular beds in the Devonian/Carboniferous boundary interval of the Kowala section from the western part of the Holy Cross Mountains resemble those in a succession of equivalent age from the Rhenish Massif. Both areas are characterized by similar lithological horizons and changes of biotic assemblages within the same conodont zones. Strata and fauna from the uppermost Famennian are influenced by the global regressive Hangenberg Event.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formations recifales du Devonien des Monts de Sainte-Croix (Pologne)
Utwory rafowe w dewonie Gór Świętokrzyskich
Rifovye obrazovanija devona Sventokrzhiskikh Gor (Polsha)
Autorzy:
Pajchlowa, M.
Stasinska, A.
Tematy:
Holy Cross Mountains
Polska
paleontology
Devonian
reef
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/21215.pdf  Link otwiera się w nowym oknie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D morphology of post mortem acrothoracican borings in Famennian heterocorals : a morphological diversification or a continuum ichnospecies?
Autorzy:
Dworczak, Patrycja G.
Jarochowska, Emilia
López Correa, Matthias
Berkowski, Błażej
Tematy:
acrothoracican barnacles
Heterocoralia
bioerosion
Late Devonian
Morocco
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/2171823.pdf  Link otwiera się w nowym oknie
Opis:
Barnacle borings were found in six heterocoral skeletons. They are present as small (up to 2.9 mm long), slender, pouch-shaped borings with tapering, slit-like openings. The investigated borings were made by acrothoracican cirripedes, which mostly do not have a shell and bore into hard substrates to protect their “naked” bodies. The first occurrence of borings in skeletons of the heterocoral Oligophylloides Różkowska, 1969 from the Upper Devonian Tafilalt Platform was reported recently by Weyer in 2016. Here, the authors present the results of a detailed study of heterocoral remains with numerous acrothoracican borings from Jebel Bou Ifarherioun (Famennian, Anti-Atlas, Morocco). The borings were found on the basal part but also on broken branches and stems of the heterocoral corallum and occurred post mortem. There is no indication of a syn vivo coral-barnacle interaction with borings in tissue-covered areas. The authors used micro-CT scans to visualize the 3D morphology of the pits, their orientation, and distribution. Additionally, the 3D morphology of an assemblage of 75 pits was used to carry out ordination and cluster analyses, which showed that previously proposed ichnospecies may be a continuum of morphological variability. In the basis of measurements by the present authors, the studied borings do not fit any known ichnotaxa. The absence of bourrelets excludes the possibility that the borings studied belong to the ichnogenus Rogerella Saint-Seine, 1951. Hence, the results seem to contradict a synonymization that was proposed by Bromley and D’Alessandro (1987) and subsequent authors and leave room for further research and discussion on this topic. Although the inferred boring organism is a filter feeder and, thus, depends on currents, the authors did not find a preferential orientation of the borings. The samples considered here are the best-preserved Devonian barnacle borings to date.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new genus of lungfish from the Givetian [Middle Devonian] of central Australia
Autorzy:
Clement, A.M.
Tematy:
new genus
lungfish
Givetian
Middle Devonian
Australia
salamanderfish zob.lungfish
Dipnoi
phylogenesis
Devonian
Harajica Formation
dipnoan zob.lungfish
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/20597.pdf  Link otwiera się w nowym oknie
Opis:
A new Dipterus−like lungfish, Harajicadipterus youngi, is described from the Givetian (Middle Devonian) Harajica Sandstone Member of central Australia. The material is comprised of five specimens representing the skull roof, orbital bones, tooth plates, operculogular bones, a partial pectoral girdle, centra and scales. Harajicadipterus can be distinguished from other dipnoans by its long postorbital cheek, broad B bone, lack of contact between E and C bones, and radiating tooth rows with some denticles evident between the rows. Results of a cladistic analysis of 81 characters for 33 dipnoan taxa resolved Harajicadipterus below the holodontid clade but as more derived than Dipterus and the chirodipterid clade.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alkaline rocks of the Ukrainian Shield: Some mineralogical, petrological and geochemical features
Autorzy:
Ponomarenko, Aleksandr N.
Kryvdik, Stepan G.
Grinchenko, Aleksandr V.
Tematy:
Ukrainian Shield
alkaline magmatism
Proterozoic
Devonian kimberlites
Pokaż więcej
Wydawca:
Polskie Towarzystwo Mineralogiczne
Powiązania:
https://bibliotekanauki.pl/articles/127598.pdf  Link otwiera się w nowym oknie
Opis:
The Ukrainian Shield (USh) is a typical province of Proterozoic alkaline magmatism where about 50 massifs and occurrences of alkaline rocks and carbonatites have been found. In spite of the wide distribution of Devonian basaltic- and alkaline magmatic rocks in the Dnieper-Donetsk depression adjacent to the USh, and in a marginal zone of the USh adjacent to folded Donbass, only alkaline rocks of Proterozoic age (1.8-2.1 Ga) that have been identified in the central interior of the USh. Some discrete bodies of 2.8 Ga subalkaline rocks also occur in Bogdanivka massif (Azov area). Occurrences of both Proterozoic (prevailing) and Phanerozoic (Devonian) alkaline rocks and kimberlites are only found in the eastern part of the USh (Azov area). Kimberlites in the central part of the Ukrainian Shield (Kirovograd region) are also of Proterozoic age (ca 1.8 Ga). It is this predominance of Precambrian rocks that makes the USh so different from other alkaline provinces where Phanerozoic alkaline rocks and kimberlites commonly prevail over Precambrian rocks. The lack of Phanerozoic alkaline magmatism on USh is poorly understood. Two main complexes of alkaline rocks - alkaline-ultrabasic (carbonatitic) and gabbro- syenitic - are distinguished in the USh. There are also rare occurrences of rock types such as alkaline- and alkaline-feldspar granites that may represent one separate alkaline-granite complex. Alkaline rocks present in the Eastern (Azov) province and in the Western province display essentially different geochemical character. Those of the Eastern province show characteristics typical of alkaline-ultrabasic rocks (e.g. high contents of incompatible rare elements 116 such as Nb, REE, Zr, Y, Sr, whereas those in the Western province are characterized by low contents of Nb and Zr, and REE in some cases. This fact is interpreted as reflecting different geodynamic conditions of their origin. The Eastern rocks were formed in rift settings, the Western rocks in crustal compressional settings (collision, subduction). Various mineral deposits of phosphorus (apatite), niobium, REE, yttrium and zirconium, including unusually rich ores of REE, Y and Zr (Azov and Yastrybetsky) are associated with the alkaline rocks and carbonatites of the USh.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New cranial material of the acanthothoracid placoderm Palaeacanthaspis vasta from the Lower Devonian of Podolia—phylogenetic and taxonomic significance
Autorzy:
Dupret, V.
Szaniawski, H.
Dec, M.
Szrek, P.
Tematy:
Placodermi
Acanthothoraci
neurocranium
Lochkovian
Devonian
Podolia
Ukraine
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/2082331.pdf  Link otwiera się w nowym oknie
Opis:
The Early Devonian vertebrates of Podolia in Ukraine are well known thanks to the material of the basal arthrodire placoderm genus Kujdanowiaspis, originally mentioned by Brotzen in 1934. The anatomical fame of Kujdanowiaspis brought by Erik Stensiö almost eclipsed the presence of the acanthothoracid placoderm Palaeacanthapsis vasta in the underlying beds, with the original material of P. vasta being less well preserved and abundant than that of Kujdanowiaspis. Here we describe a newly discovered specimen of the acanthothoracid P. vasta from the Lochkovian of Podolia (Ukraine). The specimen, although incomplete, is very well preserved in three dimensions and allows a thorough description of its external morphology, which is compared to that of Romundina stellina and other well-known Acanthothoraci. A phylogenetic analysis is performed and the acanthothoracid nature of Palaeacanthaspis is confirmed. However, the position of Palaeacanthaspis within the Acanthothoraci remains uncertain, and its resemblance with Romundina could be due to either synapomorphies or symplesiomorphies. Similarities and differences between the two forms are exposed, and lead to the lack of synonymy at the specific level. Generic synonymy is also questioned for the first time but remains equivocal.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Palaeomagnetism of some Devonian carbonates from the Holy Cross Mts.(Central Poland): large pre-Permian rotations or strain modifiedpalaeomagnetic directions?
Autorzy:
Grabowski, J.
Nawrocki, J.
Tematy:
Polska
Holy Cross Mountains
Devonian palaeomagnetism
remagnetisation
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059268.pdf  Link otwiera się w nowym oknie
Opis:
Palaeomagnetic studies of Middle and Upper Devonian carbonate rocks in the Holy Cross Mts. (Central Poland, SW foreland of the East European Craton - EEC) involved samples from the southern (Kielce) and northern (Łysogóry) unit. Haematite-bearing carbonates showed syn-folding remagnetisation of Early Permian age. The pole of this component is situated on the apparent polar wander path (APWP) of the EEC. The syn-folding age implies deformation of the Variscan syncline during Alpine uplift of the Holy Cross Mts. In dark limestones and dolomites magnetite was a dominant magnetic mineral. The age of magnetisation is interpreted as pre-Late Carboniferous: syn-folding in one locality and either pre- or syn-folding in four others. Four poles calculated from these components are shifted to the NW from the reference southern APWP for the EEC and one pole is concordant with its Early Carboniferous segment. The occurrence of rotated and unrotated palaeomagnetic poles could indicate that some fragments of both Kielce and Łysogóry units were subjected to local clockwise rotations during Variscan compression. An alternative explanation might be that Variscan pre- and/or syn-folding components could be strain modified or resultant magnetisations and they should not be used in palaeotectonic reconstruction.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Middle Devonian uncinuloids (Brachiopoda, Rhynchonellida) from North Africa and Central Europe
Autorzy:
Halamski, Adam T.
Baliński, Andrzej
Jansen, Ulrich
Tematy:
systematics
Brachiopoda
Rhynchonellida
Devonian
Germany
Polska
Morocco
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/1836359.pdf  Link otwiera się w nowym oknie
Opis:
The paper includes a taxonomic revision of four externally similar Middle Devonian rhynchonellide species from northwestern Africa (Maïder, Tindouf Syncline) and Central Europe (Eifel, Bergisches Land, Holy Cross Mts.), considered in recent papers as representatives of Kransia Westbroek, 1967 or Nalivkinaria Rzhonsnitskaya, 1968. All four possess a septalium and a multilamellate cardinal process, the assignment to Nalivkinaria, having a bifid cardinal process, is therefore clearly inappropriate. Lebanzuella? issoumourensis (Drot, 1971) is present in the Givetian of Africa; two subspecies, L.? issoumourensis issoumourensis from Jbel Issoumour and L.? issoumourensis smarensis ssp. nov. from Western Sahara, are distinguished by their biometric characteristics. The other two species are included in Kransia (Fatimaerhynchia) subgen. nov. differing from Kransia (K.) in the presence of a septalium; the occurrence of such a variable structure is considered to be justification for distinction at the subgenus level. Kransia (Fatimaerhynchia) goldfussii (Schnur, 1853) is an Eifelian species. Kransia (Fatimaerhynchia?) aff. goldfussii from the Givetian of Bilveringsen is a separate species (larger, more transverse, more strongly ornamented), which is not described because of insufficient material. Kransia (Fatimaerhynchia) signata (Schnur, 1851) is present in the Middle Devonian of Jbel Issoumour, the middle Eifelian of the Eifel and the (upper?) Givetian of the Holy Cross Mountains.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new pleurocystitid blastozoan from the Middle Devonian of the Eifel (Germany) and its phylogenetic importance
Autorzy:
Nardin, E.
Bohaty, J.
Tematy:
new pleurocystitid blastozoan
blastozoan
Middle Devonian
Germany
phylogenetic importance
Echinodermata
Blastozoa
Pleurocystitidae
Regulaecystis
evolution
paleoecology
Eifelian
Devonian
Rhenish Massif
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/20422.pdf  Link otwiera się w nowym oknie
Opis:
Rich echinoderm fauna from the Middle Devonian of the Eifel (Rhenish Massif, Germany) has yielded specimens of the rare recumbent pleurocystitid rhombiferans. Regulaecystis testudineus sp. nov. extends the stratigraphic range of the pleurocystitids to the Eifelian (Middle Devonian). Specimens show a strongly inflated and ornamented theca, which is unusual for the European pleurocystitids. Phylogenetic analysis of all described pleurocystitid genera suggests a close relationship of Regulaecystis with the other Devonian genera. Results indicate that the degree of inflation and of ornamentation of the theca can be interpreted as convergences within the pleurocystitids due to environmental conditions (such as surface consistency, hydrodynamism). R. testudineus sp. nov. was living as a strict epibenthic vagile organism; lying on muddy soft to firm substrates in quiet to agitated shallow warm water environments.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Timing of the onset of Devonian sedimentation in northwestern Poalnd: palynological evidence
Początek dewońskiej sedymentacji w północno-zachodniej Polsce: przesłanki palinologiczne
Autorzy:
Turnau, E.
Matyja, H.
Tematy:
northwestern Poland
Ordovician
Silurian
Devonian
sporomorphs
stratigraphy
redeposition
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/191429.pdf  Link otwiera się w nowym oknie
Opis:
Palynomorph assemblages of low taxonomic diversity are recorded from the basal Devonian strata in three boreholes in western Pomerania and Kujawy. The palynoflora is assigned to a younger, autochtonous assemblage, and an older, redeposited one. The composition of the younger assemblage suggests lower to middle Eifelian. The older palynomorphs are derived from (1) Upper Ordovician or Lower Silurian, and (2) probably from Upper Silurian deposits.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trace fossils from Silurian and Devonian turbidites of the Chauvay area, southern Tien Shan, Kyrgyzstan
Autorzy:
Warchoł, M.
Leszczyński, S.
Tematy:
Tien Shan
Kyrgyzstan
Silurian-Devonian
turbidites
trace fossils
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/191868.pdf  Link otwiera się w nowym oknie
Opis:
The siliciclastic turbidite successions (Pul’gon and Dzhidala Formations) that crop out in the eastern part of the Chauvay River valley, are marked on geological maps as a belt of terrigenous deposits of Silurian-Devonian age. They resemble deposits of overbank areas and depositional lobes of deep sea fans, and display common trace fossils particularly on lower surfaces of sandstone beds. Sixteen ichnotaxa representing four morphological groups have been distinguished. The trace fossil assemblages suggest their affiliation to the Nereites ichnofacies. Various branched, preturbidite forms predominate in both examined units, although the assemblages of individual units differ slightly in composition. In the Pulg’on Formation, small, densely distributed burrows commonly occur on lower surfaces of sandstone beds. Shallow burrowing depth together with relatively low diversity trace fossil assemblages indicate lowered oxygenation of the sea floor.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new subdisarticulated machaeridian from the Middle Devonian of China: Insights into taphonomy and taxonomy using X-ray microtomography and 3D-analysis
Autorzy:
GÜGEL, BENJAMIN
DE BAETS, KENNETH
JERJEN, IWAN
SCHUETZ, PHILIPP
KLUG, CHRISTIAN
Tematy:
annelida
lepidocoleidae
tomography
spiers
taphonomy
devonian
china
guangx
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/945234.pdf  Link otwiera się w nowym oknie
Opis:
Machaeridians are an extinct group of armoured annelids, which are mainly known from isolated sclerites present from the Ordovician to the Permian. Based on articulated specimens with preserved soft-tissues and trace fossils, derived machaeridians are interpreted to have an infaunal burrowing mode of life. However, the taphonomy of sclerite associations is still largely unstudied. We herein investigated associated sclerites from the Middle Devonian of China using micro-computer tomography and 3D-analysis. These sclerites belong to a single individual and lie in close proximity. The absence of indications for current alignment, major bioturbation or other processes causing a disarticulation as reflected in the randomly arranged dacryoconarids suggest that the sclerites became disarticulated in the course of the normal decay processes, perhaps aided by scavenging and incomplete burial. The unique morphology of the sclerites indicates that the specimen presented here belongs to a previously undescribed species, which we describe herein as Lepidocoleus kuangguoduni sp. nov.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conodont biostratigraphy of the Frasnian-Famennian boundary in the Esfahan and Tabas areas, Central Iran
Autorzy:
Gholamalian, H.
Tematy:
Iran
Late Devonian
Frasnian-Famennian boundary
biostratigraphy
conodonts
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059517.pdf  Link otwiera się w nowym oknie
Opis:
The Frasnian-Famennian (F-F) boundary in Central Iran has been investigated on the basis of conodont faunas (34 species and subspecies) from four sections: Chahriseh near Esfahan, and Kal-e-Sardar, Howz-e-Dorah and Ghale-Kalaghu near Tabas. The F-F boundary in the Chahriseh section is located in a one-metre interval between beds EX1 and F-F9 whereas in the Kal-e-Sardar section it is at the base of bed Cly1. The F-F boundary can not be recognized in the Howz-e-Dorah and Ghale-Kalaghu sections be cause of uncon form able relation ships and erosion of the upper most late Frasnian beds indicated incidentally by reworked boulders (indicating con temporaneous tectonic activity) and by the abrupt appearance of contrasting environments, including tempestites at the base of the lower Famennian. The best conodont and palaeoenvironmental data were obtained from the Kal-e-Sardar section where a deeper marine environment prevailed during the late Frasnian, be coming shallower in the early Famennian; the Chahriseh section displays small fluctuations in sea level during the early Famennian. The conodont faunas display the inception of the Polygnathus communis group in the late Frasnian (rhenana-linguiformis zones) and the appearance of Icriodus alternatus mawsonae in the Late rhenana Zone. A new age-range is suggested for Polygnathus aequalis Klapper and Lane, from the transitans to the linguiformis zones. Three conodont biozones are represented in the late Frasnian to early Famennian of the Chahriseh section, two late Frasnian and one early Famennian in the Kal-e-Sardar section and two biozones in the late Frasnian and early Famennian of both the Howz-e-Dorah and Ghale-Kalaghu sections. Two new species are described: Polygnathus tabasianus (Early to Late crepida zones) and Polygnathus vachiki (Late rhenana-linguiformis zones).
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental differentiation reflected in the vertebrate fauna diversity in the Lower Devonian of the Holy Cross Mountains, Poland
Autorzy:
Wilk, Olga
Szrek, Piotr
Ginter, Michał
Tematy:
vertebrates
Lower Devonian
Emsian
Holy Cross Mountains
environment
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2201204.pdf  Link otwiera się w nowym oknie
Opis:
The Lower Devonian of the Holy Cross Mountains is well-known in the field of vertebrate palaeontology but remains unrecognized as regards palaeoenvironmental reconstructions. We therefore analysed the spatial distribution and relative abundance of fossil vertebrates in this area within one time interval. The fauna from an Early Devonian (Emsian) siliciclastic bone-bearing breccia (the “Placoderm Sandstone”) exposed in four sections of the Łysogóry region and five sections of the Kielce region was analysed with respect to the frequency of the remains and their taxonomic affinity. The relative abundances of agnathans, acanthodians, placoderms, osteichthyans and chondrichthyans suggest more open marine conditions in the Łysogóry region and more terrestrial-influenced in the Kielce region during the Emsian. The results show that the average agnathan and acanthodian content of the Łysogóry region is significantly larger than that in the Kielce region. On the other hand, there are relatively fewer osteichthyans in the Łysogóry region and a significantly higher proportion of bony fishes was recorded in the fauna of the Kielce region. Placoderms are characterized by their generally similar frequency in both regions and from site to site in each of them, though a greater abundance was noted from the Kielce region. Likewise differences in the proportions of particular groups in the Kielce region suggest a large variety of marginal-marine environments under the influence of factors that might have included marine currents and variable conditions around a river mouth.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Late Devonian Upper Kellwasser Event and entomozoacean ostracods in the Holy Cross Mountains, Poland
Autorzy:
Olempska, E
Tematy:
ostracod
Polska
entomozoacean ostracod
Ostracoda
Upper Kellwasser Event
paleoenvironment
Famennian
stratigraphy
Frasnian
Late Devonian
Devonian
Entomozoacea
extinction
Holy Cross Mountains
paleontology
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/20081.pdf  Link otwiera się w nowym oknie
Opis:
Late Frasnian–Early Famennian entomozoacean ostracod assemblages from the Płucki section in the Holy Cross Mountains were studied to establish the effect of the “Kellwasser bio−event” on the planktonic biodiversity and faunal content. The composition of ostracod assemblages changes from a moderately diverse (10 species) Entomoprimitia–Richterina– Nehdentomis–Nandania dominated “background” assemblage characterising a pre−event interval, to an Entomoprimitia−assemblage during the event interval, and finally to a Franklinella−dominated post−event assemblage in the Middle Palmatolepis triangularis conodont Zone. The Frasnian–Famennian extinction caused substantial losses among entomozoacean lineages. In the Płucki section it occurred in two closely spaced steps within the Palmatolepis linguiformis conodont Zone. The first step, at the base of the dark cephalopod limestone (Upper Kellwasser Horizon), reduced the abundance and the species diversity of entomozoaceans to only two Entomoprimitia species. The vacant niche was then filled by the new, immigrant species Entomoprimitia (Entomoprimitia) kayseri which is dominant in the Upper Kellwasser interval. All these species were lost at the second step within the Upper Kellwasser Horizon. The entomozoaceans remained virtually absent during a long time interval between the end−Frasnian crisis and the Middle Pa. triangularis Zone. They reappear as new species from refugia lineages (Franklinella, Nehdentomis) and became widespread, indicating favourable ecological conditions. Some 13 species have been identified and assigned to seven genera. Rabienella? lagowiensis sp. nov. is proposed.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Depositional history of the Devonian succession in the Pomeranian Basin, NW Poland
Autorzy:
Matyja, H.
Tematy:
NW Poland
Pomeranian Basin
Devonian
stratigraphy
depositional history
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2060625.pdf  Link otwiera się w nowym oknie
Opis:
Evolution of the Pomeranian Basin (NW Poland) dur ing the Devonian saw the development of a characteristic siliciclastic and mixed siliciclastic-carbonate marginal marine-to-open marine carbonate sedimentary succession. This was controlled via proximity of the land areas representing uplifted parts of the East European Craton (EEC): the Fennoscandian High extending in the north, and the Mazury–Belarus High, situated in the east. The depositional history of the Pomeranian Basin began not earlier than at the end of the Emsian or possibly in the Eifelian, after a long break spanning the Lochkovian, Pragian and much of the Emsian when the area was subjected to erosion. Sedimentation started in the north eastern part with marginal-marine clastic deposits with local evaporites which are dated as uppermost Emsian?–Eifelian, passing upwards into lower–middle Givetian marginal-marine siliciclastic and carbon ate de posits; these are followed by upper Givetian marginal-marine siliciclastic rocks. In the south western part of the area, the Devonian succession started with marginal-marine carbonates and siliciclastics which belong to the upper most Emsian?–Eifelian, followed by lower and middle Givetian carbonates, passing upwards into upper Givetian marginal-marine siliciclastics. During the Late Devonian the Pomeranian Basin underwent evolution from a marginal-marine in the earliest Frasnian, through carbonate ramp or platform/shelf basin settings during the rest of the Frasnian and early Famennian, up to a reappearance of shallow subtidal and marginal-marine environments in late Famennian time. At the end of the Famennian an open shelf environment became prevalent almost over the whole area and continued up to the Mid Tournaisian. The lateral relation ships of the lithofacies during the Givetian, Frasnian and Famennian are portrayed on 11 maps, showing relatively short time-intervals, selected to depict the most sigificant environmental changes. Transgressive-re gres sive depositional cy cles ob served in the Pom er a nian Ba sin seem to have been strongly con trolled by sea level vari a tions, prob a bly of eustatic na ture; how ever, tec tonic ac tiv ity of some struc tural el e ments lo cally mod i fied the sed i men tary re cord.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chondrichthyan fauna of the Frasnian-Famennian boundary beds in Poland
Autorzy:
Ginter, M
Tematy:
fauna
locality
Polska
Devonian
Kellwasser Event
paleontology
Chondrichthyes
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/22441.pdf  Link otwiera się w nowym oknie
Opis:
New chondrichthyan microremains from several Frasnian–Famennian sections in the Holy Cross Mountains and Dębnik area (Southern Poland) are investigated and compared to previous data. The reaction of different groups of chondrichthyans to environmental changes during the Kellwasser Event is analysed. Following the extinction of phoebodont sharks of Phoebodus bifurcatus group before the end of the Frasnian, only two chondrichthyan species, viz. Protacrodus vetustus Jaekel, 1921 and Stethacanthus resistens sp. nov. (possibly closely related to “Cladodus” wildungensis Jaekel, 1921), occur in the upper part of Frasnian Palmatolepis linguiformis conodont Zone and persist into the Famennian. Global cooling is considered a possible cause of the extinction of Frasnian subtropical phoebodonts on Laurussian margins.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Marisastridae n.fam. and Marisastrum n.gen. (Devonian corals)
Marisastridae n.fam. i Marisastrum n.gen. (korale dewońskie)
Marisastridae n.fam. i Marisastrum n.gen. (devonskie korally)
Autorzy:
Rozkowska, M.
Tematy:
paleontology
Marisastridae
Marisastrum
new genus
Ceratophyllum
Devonian
coral
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/23148.pdf  Link otwiera się w nowym oknie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trace fossils from Silurian and Devonian turbidites of the Chauvay area, southern Tien Shan, Kyrgyzstan
Autorzy:
Warchoł, M.
Leszczyński, S.
Tematy:
Tien Shan
Kyrgyzstan
Silurian-Devonian
turbidites
trace fossils
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/191469.pdf  Link otwiera się w nowym oknie
Opis:
The siliciclastic turbidite successions (Pul’gon and Dzhidala Formations) that crop out in the eastern part of the Chauvay River valley, are marked on geological maps as a belt of terrigenous deposits of Silurian–Devonian age. They resemble deposits of overbank areas and depositional lobes of deep sea fans, and display common trace fossils particularly on lower surfaces of sandstone beds. Sixteen ichnotaxa representing four morphological groups have been distinguished. The trace fossil assemblages suggest their affiliation to the Nereites ichnofacies. Various branched, preturbidite forms predominate in both examined units, although the assemblages of individual units differ slightly in composition. In the Pulg’on Formation, small, densely distributed burrows commonly occur on lower surfaces of sandstone beds. Shallow burrowing depth together with relatively low diversity trace fossil assemblages indicate lowered oxygenation of the sea floor.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka składu mineralnego i chemicznego dolomitu dewońskiego ze złoża „Nowa Wioska” w aspekcie jego wykorzystania w przemyśle materiałów ogniotrwałych
The mineral and chemical composition characteristics of the Devonian dolomite from the “Nowa Wioska” deposit in aspects of its applications in the refractory industry
Autorzy:
Bagiński, M.
Tematy:
dolomit dewoński
Nowa Wioska
materiały ogniotrwałe
Devonian dolomite
refractories
Pokaż więcej
Wydawca:
Stowarzyszenie Inżynierów i Techników Górnictwa
Powiązania:
https://bibliotekanauki.pl/articles/165416.pdf  Link otwiera się w nowym oknie
Opis:
W artykule przedstawiono wyniki badań składu mineralnego i chemicznego dolomitu dewońskiego ze złoża „Nowa Wioska” oraz, w oparciu o kryteria określone w normie BN-86/6761-16, dokonano wstępnej oceny przydatności kopaliny dla zastosowań przemysłu materiałów ogniotrwałych. W badanych próbkach dominującym składnikiem, widocznym w obrazie mikroskopowym był dolomit, stwierdzono również występowanie związków żelaza, chalcedonu i kalcytu, prawdopodobnie wtórnego, wypełniającego żyły. Ponadto, w dyfraktogramach rentgenowskich niektórych próbek oznaczono linie dyfrakcyjne kwarcu/chalcedonu. Dolomity dewońskie cechuje struktura różnoziarnista, grubokrystaliczna. Wyniki badania składu chemicznego wykazały, że dolomity dewońskie ze złoża „Nowa Wioska” charakteryzują zbliżone zawartości CaO, MgO, Al2O3 i Fe2O3. Badane dolomity charakteryzują się niską zawartością niepożądanych domieszek, w związku z czym mogłyby zostać zaklasyfikowane do najlepszych gatunków. Przeprowadzona wstępna ocena wskazuje na możliwość wykorzystania dolomitów dewońskich ze złoża „Nowa Wioska” dla celów przemysłu materiałów ogniotrwałych. Wymaga to jednak przeprowadzenia badań składu chemicznego i parametrów strukturalno-teksturalnych, w znacznie szerszym zakresie i przy zastosowaniu dokładniejszych metod badawczych.
The results of the laboratory survey of mineral and chemical composition of the Devonian dolomite from the “Nowa Wioska” deposit as well as the assessment of its utility for the refractory industry applications, on the basis of the BN-86/6761-16 standard, are presented in this paper. The examined rocks are composed mainly of dolomite, but iron minerals, chalcedony and calcite, probably secondary, which fills veins, were also identified by the microscopic analysis. Moreover, in diffraction patterns of some samples quartz/ chalcedony was identified. The inequigranular, coarse-grained texture is characteristic for Devonian dolomites. The results of the chemical composition analysis show that Devonian dolomites from the “Nowa Wioska” deposit demonstrate similar calcium, magnesium, aluminum and iron oxides content. The Devonian dolomites are characterized by low content of the undesirable additives, therefore they can be classified to the prime types. The preliminary survey indicates that there are some possibilities of using Devonian dolomites from the “Nowa Wioska” deposit as raw materials in manufacturing of refractories. Again, more detailed analyses of the chemical composition and texture parameters, in wider range and by more precise analysis methods, would be required.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Współwystępowanie mineralizacji kruszcowej i węglowodorów : przykład dolomitów dewońskich w Józefce w Górach Świętokrzyskich
Coexistence of ore mineralization and hydrocarbons : the example of Devonian dolomites in Józefka in Świetokrzyskie (Holy Cross) Mountains
Autorzy:
Pawlikowski, M.
Nieć, M.
Tematy:
dolomity dewońskie
mineralizacja
węglowodory
devonian dolomites
ore mineralization
hydrocarbons
Pokaż więcej
Wydawca:
nakł. Maciej Pawlikowski
Powiązania:
https://bibliotekanauki.pl/articles/343962.pdf  Link otwiera się w nowym oknie
Opis:
Rozpoznano mineralizacje występująca w ciemnych dewońskich wapieniach w kamieniołomie Józefka w miejscowości Górno, koło Kielc. Stwierdzono, że mineralizacja zarówno kruszcowa jak i niekruszcową obecna jest m.in. w systemach spękań wypełnionych węglowodorami. Węglowodory występują w dolomitach także jako substancje rozproszone nadając wapieniom ciemny kolor. W tych wapieniach występują w formie rozproszonej podwyższone ilości m.in. ziem rzadkich. Sposób występowania węglowodorów (forma rozproszona i żyłkowa) oraz wstępne analizy ich składu może sugerować, że mogą to być zarówno węglowodory (pierwotne, rozproszone) jak i wtórne (występujące w formach żyłkowych).
Ore and non – ore mineralization in cracks filled with hydrocarbons in the dark grey Upper-Devonian limestone has been conformed in the Jozefka quarry of Devonian limestones and dolomite in the town Góra near Kielce. Hydrocarbons in dolomite are scattered , giving the limestone a dark colour. The coexistence of ore and hydrocarbon mineralization suggest their common origin.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Późno dewońskie impakty
Late Devonian impacts
Autorzy:
Brachaniec, Tomasz
Brom, Krzysztof
Tematy:
Frasnian-Famennian boundary
Late Devonian
Siljan crater
mass extinction
Pokaż więcej
Wydawca:
Polskie Towarzystwo Meteorytowe
Powiązania:
https://bibliotekanauki.pl/articles/1033026.pdf  Link otwiera się w nowym oknie
Opis:
In 1970 the first hypothesis, which claimed that large meteorite landed in ocean at Frasnian/Famennian boundary and caused mass extinction was proposed. In Late Devonian deposits there are many potential impact evidences. Nonetheless, many years of searching for iridium anomaly, shocked minerals, microtektites and craters in the F/F boundary passage deposits have failed. The most probably crater, which could be connected with F/F boundary is Siljan Ring in Sweden.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new assessment of the Late Devonian antiarchan fish Bothriolepis leptocheira from South Timan (Russia) and the biotic crisis near the Frasnian–Famennian boundary
Autorzy:
LUKŠEVIČS, ERVĪNS
BEZNOSOV, PAVEL
STŪRIS, VALDEMĀRS
Tematy:
placodermi
diversity
variability
devonian
frasnian
famennian
russia
south timan
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/945315.pdf  Link otwiera się w nowym oknie
Opis:
The species of the Late Devonian, earliest Famennian placoderm fish Bothriolepis jeremejevi has been downranked to subspecies Bothriolepis leptocheira jeremejevi comb. nov. in a result of detailed morphological studies of the type specimens and abundant new material from the type locality of the Sosnogorsk Formation, South Timan, Komi Republic, Russia. This taxon closely resembles Bothriolepis leptocheira leptocheira from Scotland, B. leptocheira curonica from Latvia, and B. leptocheira ssp. from Severnaya Zemlya differing only in small deviations of the size, proportions and shape of some plates of the armour. The composition of vertebrate assemblages from Scotland, Latvia, and Severnaya Zemlya containing B. leptocheira demonstrates a reduced diversity of antiarch placoderm, acanthodian, and sarcopterygian fishes; however, the Sosnogorsk assemblage differs in a larger diversity containing very primitive tetrapod and diversified sarcopterygian fishes including dipnoans and porolepiforms but lacking acanthodians. Wide distribution of a single species of Bothriolepis and usually diminished diversity of vertebrates suggest that the earliest Famennian vertebrate assemblages conform the survival faunas of the latest Frasnian–earliest Famennian biotic crisis.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Placoderms from the Lower Devonian “placoderm sandstone” of the Holy Cross Mountains, Poland with biostratigraphical and palaeobiogeographical implications
Autorzy:
SZREK, PIOTR
DUPRET, VINCENT
Tematy:
placodermi
arthrodira
actinolepidoidei
palaeobiogeography
devonian
poland
holy cross mountains
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/945951.pdf  Link otwiera się w nowym oknie
Opis:
The siliciclastic sequence of the Lower Devonian of the southern part of the Holy Cross Mountains in Poland is renown for abundant vertebrate fossils, including ostracoderm, sarcopterygian, acanthodian, chondrichthyan, and placoderm remains. Study of the vertebrate assemblage from the “placoderm sandstone” from Podłazie Hill in the Holy Cross Mountains reveals that the remains belong to Kujdanowiaspis sp. among other unspecified actinolepids and brachythoracids. The Polish actinolepid material is characterised by sizes bigger than those of the Podolian specimens; this may be related to geographic variation. Owing to the proximity between Podolia and Holy Cross Mountains we suggest that Kujdanowiaspis sp. from the Holy Cross Mountains may be a refugee of some species of Kujdanowiaspis from the Lochkovian–Pragian of Podolia and/or from Spain. Some anterolateral plates provisionally assigned to Arthrodira indet. probably represent a new genus due to the high overlapping surface for median dorsal and anteroventrolateral plates.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Devonian palaeogeography of the Southern Urals
Autorzy:
Mizens, G. A.
Tematy:
Southern Urals
Devonian
sedimentary basin
palaeogeography
olistostrome
eustatic changes
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2058864.pdf  Link otwiera się w nowym oknie
Opis:
Devonian deep-water deposits of the Southern Urals are represented mainly by flysch and cherty units. The main sedimentary basins (marginal sea and back-arc basin) and their origin, evolution and principal depositional environments are characterised. The main sources of clastic material were the Uraltau microcontinent (especially in the Famennian, when a mountain range formed following collision with an island arc) and two island arcs: the Irendyk, at the end of the Early and at the beginning of the Mid Devonian; and the Magnitogorsk, in the Mid to Late Devonian. Comparison with transgressive-regressive cycles established in Devonian epicontinental basins worldwide indicates that these global sea level fluctuations were recorded also in the Southern Urals deep-water settings. This applies primarily to the Eifelian and Frasnian-Famennian transgressive-regressive cycles.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The youngest Devonian record of "Housean pits" in ammonoids
Autorzy:
Rakociński, M.
Tematy:
ammonoids
parasite
pearl formation
"Housean pits"
Polska
Upper Devonian
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059005.pdf  Link otwiera się w nowym oknie
Opis:
An unusual occurrence of parasitic "Housean pits" in internal mould of ammonoid specimen referred to as Felisporadoceras cf. subvaricatum (Sobolew) from Middle Famennian of Poland are described. Hitherto the youngest representatives of goniatites showing a pitting on the internal moulds were known from the Middle Devonian (lower Givetian), thus, most probably the presented material constitutes the youngest world record of this phenomenon.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Devonian magmatism in the Pripyat Palaeorift: a geodynamic model
Autorzy:
Aizberg, R. Y.
Beskopylny, V. N.
Starchik, T. A.
Tsekoyeva, T. K.
Tematy:
Pripyat palaeorift
Devonian
ultrabasic-alkaline magmatism
geodynamics
palaeovolcanoes
diatremes
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059320.pdf  Link otwiera się w nowym oknie
Opis:
Late Devonian magmatism in the Pripyat Trough, Belarus was associated with the development of the intraplate Pripyat-Donets Palaeorift. Magmatic rocks belong to an alkali-ultrabasic-alkali-basaltoid suite. These are represented by explosive, effusive, subvolcanic and volcanic facies. The magmatic activity and rock composition changes from the periphery to the axial part of the Pripyat Trough, corresponding to the general trend of destructive processes in the rifting zone. Geodynamically, the Pripyat alkali-ultrabasic rocks represent a series of magmatic suites of the Pripyat-Donets palaeovolcanic region coinciding with a zone of disappearance of Late Devonian divergence processes in the south-west of the East European Craton.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Traces of dipnoan fish document the earliest adaptations of vertebrates to move on land
Autorzy:
Szrek, P.
Grygorczyk, K.
Uchman, Alfred
Dworczak, P. G.
Salwa, S.
Opis:
A new trackway produced by crawling fishes, which includes imprints of the trunk, snout, tail, body drag traces, and pectoral fins, was discovered in the Lower Devonian (middle–upper Emsian) marginal marine deposits in the Holy Cross Mountains, Poland. The snout imprints are represented by a low-angle variant of the already described Osculichnus tarnowskae, which has generally been interpreted as a hunting trace of fishes. However, in this case, it is considered an imprint of a fish’s snout, used for anchoring in the sediment during the locomotion of at least partially emerged fish. This compound trackway provides the first evidence of the previously unknown life behaviour and locomotion abilities of dipnoan fishes in the early stage of their evolution and documents a testing land mobility skills of vertebrates, predating by about 10 million years fully terrestrial tetrapods locomotion traces. Similar trackways are produced by extant lungfish during terrestrial locomotion. The trackway co-occurs with a new resting trace produced by a dipnoan fish supporting itself with one or two pairs of fins on the bottom.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Late Frasnian Athyridida [Brachiopoda] from Poland and the Late Devonian biotic turnover
Autorzy:
Grunt, T A
Racki, G
Tematy:
phylogenesis
brachiopod fauna
Polska
mass extinction
Athyridida
taxonomy
athyridid
Brachiopoda
Famennian
Frasnian
Late Devonian
Kellwasser Crisis
Devonian
biogeography
Holy Cross Mountains
biostratigraphy
paleontology
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/22601.pdf  Link otwiera się w nowym oknie
Opis:
Late Frasnian representatives of the order Athyridida from the Holy Cross Mountains, Poland, support the idea that the Laurussian basins were the places of origin and radiation of the subfamilies Athyridinae and Meristinae during the middle and early late Paleozoic. At least three new species have been identified from two localities (Łgawa Hill and Kowala) in the Gałęzice Syncline. Of these, one was probaby endemic (Merista rhenanensis sp. n.; maybe also ?Zonathyris sp. A), and two (Athyris postconcentrica sp. n. and Pachyplaxoides postgyralea gen. et sp. n.) were more widely distributed in this part of the Laurussian shelf, being known also from the East European Platform and Rheinisches Schiefergebirge, respectively. This confirms an intermediate biogeographic position of the Holy Cross Mountains area, belonging to an important centre of brachiopod origin and diversification. In contrast to other articulate brachiopods, athyridids reveal a higher rate of diversification, especially at the species (and partly also generic) level, during the global Kellwasser Crisis.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zarys historii górnictwa skalnego w rejonie Sitkówki (Góry Świętokrzyskie) w I połowie XX w.
Outline of the history of rock quarrying in the vicinity of the Sitkówka region (Świętokrzyskie Mountains) in the first half of the 20th century
Autorzy:
Król, Paweł
Pabian, Grzegorz
Fijałkowska-Mader, Anna
Tematy:
wydobywanie skał
wapienie dewońskie
Sitkówka
rock quarrying
Devonian limestones
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2075926.pdf  Link otwiera się w nowym oknie
Opis:
Rock quarrying in the vicinity of the Sitkówka (Sitkówka-Nowiny commune, Kielce county), which started at the beginning of the 20th century, has not yet been given a historical context. The authors based on archival sources, present the history of the development of six quarrying and processing plants involved in the extraction of rock raw materials in the first half of the XXth: Sitkówka, Jaźwica Mala, Sitkowieckie Nowiny, Belkowa, Kostrzewa and Stara Trzuskawica. The principal rochi extracted in these quarries were Middle Devonian-Givetian dolomites and stromatoporo- id-coral limestones of the Kowala Formation (Lower Sitkówka Beds). They were used mainly for the production of crushed stone, grits and lime, and less frequently of technical marbles. The modern, intensive activity of numerous industrial plants causes constant transformation of the Sitkówka area thus obscuring traces of the former quarrying activity and production infrastructure. That is why documentation of the remains of this exploitation is so important.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Piaskowce dolnego dewonu na górze Barczy (Góry Świętokrzyskie) i historia ich eksploatacji
History of exploitation of the Lower Devonian sandstones at the Barcza Hill (Holy Cross Mountains)
Autorzy:
Król, Paweł
Fijałkowska-Mader, Anna
Kozak, Bartosz
Giełżecka-Mądry, Dorota
Tematy:
piaskowce
dolny dewon
eksploatacja
Barcza
sandstones
Lower Devonian
exploitation
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2076211.pdf  Link otwiera się w nowym oknie
Opis:
The beginning of exploitation of the Lower Devonian sandstones on Barcza Hill, located in the Klonów Range in the central part of the Holy Cross Mountains, dates back to the first decade of the last century. Sandstones of the lower Emsian Barcza Beds, known in older literature as “placoderm sandstones” were mined here. By the time of World War II, there were seven mines that produced mainly paving stones and crushed stone. Three of them resumed work after the war: “Kopalnia Nowa”, “Byk” and “Przy Pomniku”. Unfavourable deposit conditions and competition of the neighbouring mining plants "Bukowa Góra” and "Wiśniówka” led to the abandonment of mining on Barcza Hill in the late 1950s. In 1984, the “Barcza” nature reserve was created, which included the two largest quarries: "Kopalnia Nowa”and "Byk”.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Storm origin of bone-bearing beds in the Lower Devonian placoderm sandstone from Podłazie Hill (Holy Cross Mountains, central Poland)
Autorzy:
Szrek, P.
Niedźwiedzki, G.
Dec, M.
Tematy:
Placoderm Sandstone
Lower Devonian
Emsian
Holy Cross Mountains
Polska
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2060466.pdf  Link otwiera się w nowym oknie
Opis:
The placoderm sandstone (Emsian, Holy Cross Mountains) exposed in the abandoned quarry at Podłazie Hill was revisited and excavated during fieldwork conducted in 2011-2013. Bone-bearing breccias were identified for the first time at this site and subjected to taphonomic analysis. Vertebrate remains are dominated by heterostracans, while true placoderms compose less than 20% of the total vertebrate assemblage. The high degree of fragmentation of the bones and low degree of abrasion indicate that the remains were reworked and transported before final burial. This is consistent with the mixed character of the bone accumulations, which comprise both open-shelf forms (acanthodians, chondrichthyans) as well as those related to marginal-marine environments (placoderms and sarcopterygians). The bone-bearing succession has been subdivided into five depositional facies attributed to a coastal lagoon influenced by stormy, possibly tidal conditions. The occurrence of the invertebrate trace fossil Ilmenichnus sp. accompanied by Lockeia and Monomorphichnus supports this interpretation.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The mid-Famennian ammonoid succession in the Rhenish Mountains: the "annulata Event" reconsidered
Autorzy:
Korn, D.
Tematy:
Late Devonian
Famennian
Rhenish Mountains
Ammonoidea
black shales
diversity
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2058845.pdf  Link otwiera się w nowym oknie
Opis:
The mid-Late Devonian pelagic sedimentary successions of the Rhenish Mountains and other regions show a double black shale horizon called the annulata Black Shale. It marks, at the species level, a prominent faunal turnover of ammonoids from the Prolobites delphinus Zone into the Platyclymenia annulata Zone. An analysis of ammonoid genera distribution, phylogenetic relationships, andmorphospace occupation demonstrates that the "annulata Event" does not correspond to a crisis of the group and does not fulfill the criteria of a major biotic event.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proliferation of abnormal palynoflora during the end-Devonian biotic crisis
Autorzy:
Filipiak, P.
Racki, G.
Tematy:
Devonian-Carboniferous transition
mutation
palynomorphs
tetrads
mass extinction
volcanism
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059045.pdf  Link otwiera się w nowym oknie
Opis:
The dispersed miospore assemblage of the Retispora lepidophyta-Verrucosisporites nitidus (LN) Zone from the Holy Cross Mountains(Poland) is marked by enrichment (above 4%) in abnormal spore morphotypes during a terrestrial flora turnover close to the Devonian-Carboniferous boundary, recorded just above the Hangenberg Black Shale level. Incomplete and complete tetrads represent mostly Vallatisporites spp., supplemented by Grandispora, Retusotriletes and Apiculiretusispora. Additional peculiar morphotypes, marked byanomalous overall shape and ornamentation, are interpreted as mutated varieties of Vallatisporites based on intermediate morphologicalstages, connecting them with this well known genus. This relatively high aberrant palynomorph frequency is accompanied by volcanicash intercalations, as well as by charcoal debris and polycyclic aromatic biomarkers indicative of forest wildfire. Thus, the anomalousspore morphology could reflect the mutagenic effect of regional acidification due to explosive volcanism. However, palynological literature data from NW France and Canada highlight the possibility of a supra-regional mutated miospore signal near the Devonian-Carboniferous boundary, and there is need for high-resolution studies of the LN Zone to examine this. The end-Permian scenario of abnormalfloral growth in immensely stressed habitats may therefore apply to other potentially volcanically-induced biotic turnovers.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Miospore evidence for the Carboniferous age of rocks from the Świebodzice Unit (Sudetes, SW Poland)
Autorzy:
Pluta, K.
Górecka-Nowak, A.
Tematy:
Świebodzice Unit
Devonian
Carboniferous
redeposition
stratigraphical leakage
thermal event
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059361.pdf  Link otwiera się w nowym oknie
Opis:
The paper provides new results of palynological studies of rocks from the Świebodzice Unit. An abundant Carboniferous miospores were found in rocks of the Pogorzała Formation from the southern part of this unit. These miospores occur in rocks containing also macrofloral and marine macrofaunal fossils, partly reworked, which were usually considered Upper Devonian. Two miospore sub-assemblages of different ages and colours have been distinguished. One of them consists of poorly preserved miospores, dark in colour, which indicate the Late Visean–Serpukhovian age of the rocks. The other sub-assemblage, found only in a few samples, consists of much lighter and well-preserved miospores of the Asturian age. Their presence is considered as a result of stratigraphical leakage. Observation of the miospore colour indicates that the thermal event occurred after the Late Devonian and before the Asturian and the palaeotemperature exceeded ~180°C. These new data indicate that the geological history of the Świebodzice Unit lasted longer and was much complex than it was previously considered.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Facies transition and biostratigraphic correlation of the Upper Silurian and Lower Devonian in West Bulgaria
Autorzy:
Boncheva, I.
Sachanski, V.
Lakova, I.
Yaneva, M.
Tematy:
Bulgaria
Upper Silurian-Lower Devonian
conodonts
graptolites
facies transition
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059515.pdf  Link otwiera się w nowym oknie
Opis:
Upper Silurian and Lower Devonian shelf deposits in West Bulgaria are exposed in three main Alpine tectonic units: the West Balkan Unit, the Lyubash Monocline and the Morava Unit. The West Balkan and Lyubash units consist of siliciclastic deposits: black graptolitic shales, banded pale shales and black siltstones. The Ludlow, Pridoli, Lochkovian, Pragian and Emsian were recognized on the basis of graptolite and tentaculite faunas. In the Morava Unit, the Ludlow black shales are progressively replaced by clayey limestones and nodular and micritic limestones in the Pridoli and Early Devonian. Newly obtained conodonts show the presence of the siluricus, eosteinhornensis, woschmidti, postwoschmidti, delta-pesavis, sulcatus, dehiscens and gronbergi zones. Petrographic study of the Morava Unit shows an increasing carbonate content and shallowing conditions upwards. The biostratigraphical correlation and facies interpretation reveal the coeval existence of two different depositional environments within the same shelf basin as well as a gradual shift in proximal direction.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Storm-dominated deposition on a Frasnian carbonate platform margin (Wietrznia, Holy Cross Mts., Poland)
Autorzy:
Vierek, A.
Tematy:
Polska
Holy Cross Mountains
Upper Devonian
carbonate platform
tempestites
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059533.pdf  Link otwiera się w nowym oknie
Opis:
The Wietrznia quarry in Kielce is situated between the shallow-water Devonian carbonate platform in the Kielce region and the deeper Łysogóry basin. This palaeogeographic setting affected carbonate sedimentation in Late Devonian times. The transitional facies of the Wietrznia Frasnian comprises two over lapping types of deposits: (1) micritic and marly limestone of shelf basin facies and (2) coarse-grained limestone of fore-reef facies. The first type includes laminated- and graded micritic limestone and modular limestone. The second includes intraformational conglomerates and breccias, and crinoidal limestone. The limestones in the middle Wietrznia Beds formed within storm wave basein a shal ow (possibly only a few tens of metres) sea that deepened eastwards. Storms are likely to have been the main cause of erosion and transport. In the western part of the quarry, proximal tempestites show evidence of amalgamation and cannibalism as do some high-energy flat-pebble conglomerates. With abating storm winds, finer-grained graded and laminated limestones accumulated. To ward the eastern part of the quarry, the high-energy effects of near-shore storm waves are less evident; the deposits there are transitional or more distal tempestites.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First colour-patterned strophomenide brachiopod from the earliest Devonian of Podolia, Ukraine
Autorzy:
Balinski, A.
Tematy:
paleontology
brachiopod
Brachiopoda
Strophomenida
colour pattern
Devonian
Podolia
Ukraine
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/20963.pdf  Link otwiera się w nowym oknie
Opis:
Retained colour pattern on the shells of Plectodonta sp. from the earliest Devonian of Podolia (Ukraine) is the first finding for strophomenide brachiopods and the oldest among articulate brachiopods. The colour pattern in Plectodonta sp. is composed of small, round, brownish spots scattered rather irregularly on the ventral valve only. This may suggest that the described pattern probably performed a protective function through disruptive camouflage against visual systems of potential predators. The occurrence of the colour pattern in Plectodonta sp. exclusively on the ventral valve strongly suggests that these brachiopods lived with the patterned (and convex) ventral valve upwards and the patternless concave dorsal valve facing to the underlying substrate. It thus contradicts a general assumption that concavo−convex brachiopods lived with their convex valves resting on the sediment.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lochkovian conodonts from Podolia, Ukraine, and their stratigraphic significance
Autorzy:
Drygant, D.
Szaniawski, H.
Tematy:
Lochkovian
conodont
Podolia
Ukraine
stratigraphy
Conodonta
evolution
Devonian
paleontology
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/20977.pdf  Link otwiera się w nowym oknie
Opis:
In the Podolian Dniester Basin (southwestern Ukraine) the Lower Devonian marine deposits are represented by about 530 m thick continuous sequence of interlaminated carbonate and schale outcrops at several localities. Conodonts occur in most of the carbonate layers of the whole Lochkovian but are not abundant and their ramiform elements are mostly broken or lacking. Therefore, only the pectiniform, Pa elements of twenty five stratigraphically important conodont species occurring in the region are discussed and two new species, Caudicriodus schoenlaubi and Pandorinellina? parva are proposed. The hypothetical phyletic relationships within the main representatives of the icriodontid and spathognathodontid genera, Caudicriodus, Zieglerodina, and Pandorinellina? are traced. Comparison of the previously published and newly obtained data revealed discrepancies in the hitherto used interpretation of some of the conodont taxa and their stratigraphic ranges. Contrary to the earlier reports, Caudicriodus postwoschmidti does not occur in the lower Lochkovian but only in the middle part of the Chortkiv Formation, high above the Monograptus uniformis Zone. Based on new material and verification of the previous determinations, a modified scheme of the Lochkovian conodont zonation in Podolia is proposed. Conodont zones: Caudicriodus hesperius, C. transiens, C. postwoschmidti, C. serus, and ?Caudicriodus steinachensis are distinguished. The zones are correlated with conodont zonations in other regions—Barrandian, Cantabrian Mountains, Pyrenees, and Nevada. Biostratigraphy of the Siluro−Devonian transition and Lochkovian is integrated with the carbon isotope stratigraphy.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Middle Devonian brachiopods from the southern Maїder (eastern Anti-Atlas, Morocco)
Autorzy:
Halamski, A. T.
Baliński, A.
Tematy:
systematics
Brachiopoda
Morocco
Devonian
Eifelian
Givetian
Variscan Sea
palaeobiogeography
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/191427.pdf  Link otwiera się w nowym oknie
Opis:
Sixty-two Middle Devonian brachiopod species are described on the basis of >1300 specimens from the Taboumakhlof Formation (and subordinately probably also from the top of the El Otfal Formation) at Madne el Mrakib (middle to late Eifelian or early Givetian?), Aferdou el Mrakib (late Eifelian to middle Givetian), and Guelb el Maharch (early Givetian) on the southern edge of the MaÎder Syncline (eastern Anti-Atlas, Mo- rocco). Representatives of Craniida (2 taxa), Strophomenida (5), Productida (2), Orthotetida (2), Orthida (5), Pentamerida (5), Rhynchonellida (9), Atrypida (14), Athyridida (7), Spiriferida (9), and Spiriferinida (2) are present. The fauna is dominated quantitatively by the Atrypida (24% of taxa, about the half of specimens, and the commonest species Atryparia dispersa making up about 13% of the material); the Rhynchonellida (16% of taxa, about one-sixth of specimens) are the second largest order. A new genus of the family Pugnacidae (order Rhynchonellida), Paulinaerhynchia, is proposed with the type species P. paulinae gen. et sp. nov. from Maharch; it is closest to Pugnax, from which it differs in distinct costation, lack of a dorsal septum and septalium, and rudimentary dental plates. Desquamatia (D.) deserti sp. nov., a large and finely costate representative of the genus, is described also from Maharch. Antirhynchonella and Glosshypothyridina are reported for the first time or con- firmed to be present in the Givetian. Forty (possibly up to 46) species (71 or possibly up to 82% of the taxa identified at the species level) are present also in either Eifel (Germany) or the Holy Cross Mountains (Poland). Such a high ratio of species in common attests to unconstrained faunal exchanges among benthic faunas between the northern and southern shores of the Variscan Sea during the Middle Devonian. This favours the palaeogeo- graphic hypothesis of a narrow Variscan Sea.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Casts of halite crystals in the Devonian dolomites of the Zachełmie Quarry
Ślady po kryształach halitu w dolomitach dewońskich w kamieniołomie Zachełmie
Autorzy:
Jaworska, J.
Tematy:
halit
ślady
dolomity
dewon
Zachełmie
halite
casts
dolomites
Devonian
Pokaż więcej
Wydawca:
Polskie Stowarzyszenie Górnictwa Solnego
Powiązania:
https://bibliotekanauki.pl/articles/2192095.pdf  Link otwiera się w nowym oknie
Opis:
The abandoned Zachełmie Quarry has been known for the discovery and descriptions of the trackways of a tetrapod, the oldest land vertebrate animal. Three well-preserved casts of single halite crystals were found on two salt samples collected from the same site. The sizes of the halite traces range from 1 to ca. 2.5-3 cm. Most certainly, they are two casts of hopper and one of cube form crystals. The local dolomite formations, studied and described several times in detail, indicate that a shallow and vast lagoon that had uncovered the sea bottom several times and periodically allowed for the sedimentation of evaporites was the sedimentation environment. In this paper, the author considers possible place and time of halite crystallisation, i.e. whether the crystals were precipitated from the basin’s solution or somewhat later, as a result of brine penetration through the carbonate sediment. Either halite “location” and precipitation time seem to be equally probable.
Nieczynny kamieniołom w Zachełmiu jest znany z racji odkrycia i opisu śladów najstarszego lądowego kręgowca – tetrapoda. W tym samym kamieniołomie znaleziono dobrze zachowane 3 ślady po pojedynczych kryształach halitu (na 2 próbkach skał). Wielkość śladów po tych kryształach wynosi od 1 do ok. 2,5-3 cm. Przypuszczalnie jeden ślad zostawił kryształ sześcienny, a 2 ślady powstały po kryształach typu hopper. Kilkakrotnie szczegółowo przebadane i opisane utwory dolomitowe z tego miejsca wskazują, że środowiskiem ich depozycji była płytka, rozległa laguna odsłaniająca kilkakrotnie dno i okresowo sprzyjająca sedymentacji ewaporatów. W niniejszym artykule autorka rozważa możliwość miejsca oraz czasu krystalizacji halitów, tzn. czy te kryształy wytrąciły się z roztworu w zbiorniku, czy też nieco później, już w obrębie osadu węglanowego, na skutek penetracji sedymentu przez solanki. Oba „miejsca” i czas precypitacji halitu wydają się równie prawdopodobne.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Do partly outdated palaeontological data produce just a noise? An assessment of the Middle Devonian-Mississippian biodiversity dynamics in central Asia on the basis of Soviet-time compilations
Autorzy:
Ruban, Dmitry A.
Tematy:
palaeontological data
palaeobiodiversity
mass extinctions
Middle Devonian
Late Devonian
Mississippian
central Asia
dane paleontologiczne
masa wymarła
środkowy dewon
późny dewon
missisip
centralna Azja
Pokaż więcej
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Powiązania:
https://bibliotekanauki.pl/articles/94488.pdf  Link otwiera się w nowym oknie
Opis:
Interregional tracing of trends and events in the biotic evolution is an important task of modern palaeobiology. In Soviet times (1917-1991), numerous palaeontological data have collected for the territory of Russia and neighbouring U.S.S.R. countries. Later, these data were compiled and published in a series of reference volumes. Although this information cannot be updated in a conventional way, it remains valuable for quantitative analyses, particularly because of its comprehensive and unique character. Assessment of the previously collected data on the stratigraphic distribution of Middle Devonian-Mississippian marine invertebrates in three regions of central Asia (central Kazakhstan, Uzbekistan and Tajikistan) reveals some general patterns of biodiversity dynamics. The total number of genera generally declined during the Givetian-Famennian, whereas a remarkable diversity peak occurred in the Visean. This is consistent with the global pattern and, thus, permits to hypothesize a regional signature of the global trends. Changes in the extinction rate differ, however, between central Asia and the Earth in its entirety, which may be explained particularly by biases in either the regional or the global records. Evidence of the Givetian and Frasnian/Famennian mass extinctions is found in the three regions under study. Results of this tentative study indicate important directions for further research and suggest that central Asia is a highly important domain for studies of mid-Palaeozoic biodiversity dynamics.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Middle Devonian conodonts and structural implications for Świętomarz : Śniadka section (Holy Cross Mountains)
Autorzy:
Woroncowa-Marcinowska, T.
Tematy:
Holy Cross Mountains
Łysogóry region
Middle Devonian
conodonts
geological section
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/191341.pdf  Link otwiera się w nowym oknie
Opis:
The paper presents a new interpretation of the geological structure and stratigraphy of the Devonian in the Świętomarz–Śniadka section. The uppermost Śniadka Formation (equivalent to the Nieczulice Formation), was described previously from the northern part of the section between exposures of the sandstones and shales of the Świętomarz Formation. The present study revealed the presence in the mentioned area of Sitka Coral-Crinoid Limestone Member and the Sierżawy Member, referable to the Skały Formation. Black, thin-bedded limestones, occurring here, were assigned to the upper part of the Sierżawy Member. Conodont assemblages indicate that the Sitka Coral-Crinoid Limestone Member corresponds to the hemiansatus Zone, whereas most of the Sierżawy Member represents the timorensis – rhenanus/varcus zones. The presence of the North American species Icriodus janaea is documented for the first time in Poland. Clay shales and marls with Maenioceras terebratum are considered to be the uppermost part of the Sierżawy Member. These stratigraphic data are the basis for a new interpretation of the geological structure of the Bodzentyn Syncline.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The origin of ammonoid locomotion
Autorzy:
Klug, C
Korn, D.
Tematy:
phylogenesis
Bactritida
ontogenesis
Ammonoidea
conch
coiling
Devonian
paleontology
locomotion
ammonoid
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/21156.pdf  Link otwiera się w nowym oknie
Opis:
Evolution of the coiled ammonoid conch from the uncoiled bactritid conch was probably coupled with changes in manoeuvrability and swimming velocity. The gradual transformation of uncoiled to coiled ammonoid conchs has essential functional consequences. The radical change in conch geometry during phylogeny but also in ontogeny of early ammonoids implies a shift of the aperture from an original roughly downward, via a downward oblique and an upward oblique to an upward orientation, presuming a neutrally buoyant condition of the ammonoid animal. Similar trends were reconstructed for the three main ammonoid lineages in the Middle Devonian, the agoniatitid, the anarcestid, and the tornoceratid lineages. This allowed an increase in manoeuvrability and in the maximum horizontal swimming speed.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-stage fault formation and REE distribution in the surrounding Devonian dolomites in the south-eastern part of the Holy Cross Mountains (Poland)
Autorzy:
Nieć, Marek
Pawlikowski, Maciej
Sermet, Edyta
Tematy:
Holy Cross Mountains
Devonian dolomites
fault zone
mineralization
rare earths
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:
https://bibliotekanauki.pl/articles/58810165.pdf  Link otwiera się w nowym oknie
Opis:
Metallogenic studies carried out in the Holy Cross Mountains indicate a relationship between mineralization and fault tectonics in Devonian formations. The impact of fault formation on the geochemistry of host rocks has not yet been studied. Mineralogical and geochemical studies of fault core gouges and damage zones in the fault walls of Devonian dolomites in the Budy and Jurkowice quarries were carried out. In the clay-carbonate filling of the fault fissure, the presence of two generations of Fe sulfides, the increased content of Zr, Nb, U and Th in relation to the surrounding rocks was noted. In the fault walls of the dolomites, iron sulfide and hematite mineralization were found. Research on the REE content indicates that it is lower in the fault walls than in those located far from it, while it is clearly higher in the fault gouge, especially in terms of the content of “heavy” elements (HREE). This indicates both the supply of some components to the fault zone from external sources and their displacement from the surrounding rocks. It was also found that the fault was renewed before and after the Neogene at least twice (Badenian).
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A glimpse of a fish face : an exceptional fish feeding trace fossil from the Lower Devonian of the Holy Cross Mountains, Poland
Autorzy:
Ahlberg, Per E.
Niedźwiedzki, Grzegorz
Uchman, Alfred
Dec, Marek
Salwa, Sylwester
Szrek, Piotr
Opis:
An exceptionally well-preserved assemblage of numerous invertebrate and vertebrate trace fossils is described from the Lower Devonian of the Holy Cross Mountains, southern Poland. Two trace-bearing horizons occur in the shallow-marine sequence that is exposed in a small outcrop near Ujazd village. One of the trace fossils is preserved as a bilobate, generally elliptical, epichnial pit is described as Osculichnus tarnowskae isp. nov. and interpreted as a unique example of praedichnia. Neoichnologic experiments and observations indicate that the ichnogenus Osculichnus was produced by feeding fish. The fish producing O. tarnowskae probably hunted bivalves, polychaetes and arthropods, which are represented by invertebrate trace fossils in the same horizons. The overall shape and morphological details of O. tarnowskae suggest that it was made by a lungfish broadly similar to Dipnorhynchus. The trace provides the first direct evidence for Devonian lungfish feeding behaviour, as well as the first record of three-dimensional soft-tissue morphology of the snout area of an Emsian representative of this group. The trace fossils from Ujazd provide new insight into the palaeoecology and taphonomy of the Lower Devonian of the Holy Cross Mountains.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Ichnological record of the Frasnian-Famennian boundary interval : two examples from the Holy Cross Mts (Central Poland)
Autorzy:
Stachacz, Michał
Uchman, Alfred
Rodríguez-Tovar, Francisco J.
Opis:
The Frasnian-Famennian (Late Devonian) boundary interval within the carbonate-siliciclastic series in the Kowala and Płucki sections (Holy Cross Mts, Central Poland) has been analysed to evaluate the influence of the Kellwasser event on the macrobenthic tracemaker community. The Upper Kellwasser event has a lithologically variable record, as horizons of flints (Kowala) and as a bed of bituminous, black, cephalopod limestone (Płucki). Both sections show mostly laminated, unbioturbated beds of marlstones or shales just above the Frasnian-Famennian boundary, which point to events of anoxia on the sea floor. However, the first anoxic horizon occurs below the Frasnian-Famennian boundary. The trace fossils and bioturbational structures are uncommon and poorly diversified. Trichichnus and Multina are the only frequent trace fossils in some beds. Moreover, one horizon above the Frasnian-Famennian boundary contains numerous Multina and a single? Planolites. Such poorly diversified trace fossil assemblage suggests an unfavourable environment for most of burrowing organisms and fluctuations in oxygenation from anoxic, to dysoxic conditions. The occurrence of the trace fossils and bioturbational structures as spotted and mottled ichnofabrics from the 1.3 m above the Frasnian-Famennian boundary is interpreted as an improvement in bottom water oxygen conditions after the Upper Kellwasser event.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
The simultaneous occurrence of hydrocarbons and metallic sulphides. An example of devonian dolomites at Józefka, Holy Cross Mountains, Poland
Współwystępowanie węglowodorów i siarczków metali. Przykład dolomitów dewońskich w Józefce w Górach Świętokrzyskich
Autorzy:
Pawlikowski, M.
Nieć, M.
Tematy:
Polska
ruda
węglowodory
dolomit dewoński
Polska
hydrocarbons
ores
Devonian dolomite
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Powiązania:
https://bibliotekanauki.pl/articles/216634.pdf  Link otwiera się w nowym oknie
Opis:
Ore and non-ore mineralization in cracks filled with hydrocarbons in the dark grey Upper-Devonian limestone has been found in the Józefka quarry of Upper Devonian limestone and dolomite near the Górno village near Kielce at Holy Cross Mts. Poland. Hydrocarbons in the liquid form and iron and copper sulphides appears hear in the fault zone as joints filling. The wall rocks are impregnated by hydrocarbons giving them black color. Hydrocarbon impregnations appears also following the bedding planes The coexistence of ore mineralization and hydrocarbon suggests their common origin and migration from deep-seated sources, that may be the Silurian Ordovician or Lower to Middle Devonian black shales. The metallic-hydrocarbon compounds were suggested as metals carrier. Ore and non-ore mineralization in cracks filled with hydrocarbons in the dark grey Upper-Devonian limestone has been found in the Józefka quarry of Upper Devonian limestone and dolomite near the Górno village near Kielce at Holy Cross Mts. Poland. Hydrocarbons in the liquid form and iron and copper sulphides appears hear in the fault zone as joints filling. The wall rocks are spotty impregnated by hydrocarbons giving them black color. Hydrocarbon impregnations appears also following the bedding planes The coexistence of ore mineralization and hydrocarbon suggests their common origin and migration from deep-seated sources, that may be the Silurian Ordovician or Lower to Middle Devonian black shales. The metallic-hydrocarbon compounds were suggested as metals carrier.
W kamieniołomie wapieni górno dewońskich w Józefce koło miejscowości Górno koło Kielc w Górach Świętokrzyskich stwierdzono współwystępowanie węglowodorów i siarczków żelaza i miedzi w spękaniach w strefie uskokowej. Węglowodory występują także w formie rozproszonej, plamiście w otaczających wapieniach nadając im czarną barwę oraz wzdłuż płaszczyzn ich warstwowania. Współwystępowanie węglowodorów i siarczków metali sugeruje ich wspólną genezę i migrację z głęboko położonego źródła. Skałami macierzystymi, mogły być czarne łupki występujące w utworach syluru i ordowiku oraz na pograniczu dewonu dolnego i środkowego wyróżniane jako wzbogacony w metale „poziom rudonośny”. Zwrócono uwagę, że nośnikiem metali mogły być związki metaloorganiczne. [...]
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Frasnian-Famennian boundary in the Southern Urals
Autorzy:
Abramova, A. N.
Artyushkova, O. V.
Tematy:
Southern Urals
Late Devonian
Kellwasser Event
biostratigraphy
Barma Beds
brachiopods
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2058836.pdf  Link otwiera się w nowym oknie
Opis:
On the western slope of the Southern Urals, a continuous conodont zone sequence within different facies of the Frasnian-Famennian (F-F) boundary beds is documented. In all the sections the boundary between both stages runs within lithologically uniform successions and can be determined only by a sharp faunal change. In brachiopod facies, it is placed within brachiopod shell beds and relates to the base of the Barma Beds, i.e., the level marked by a simultaneous appearance of the index brachiopod species Pugnoides(?) markovskii and the zonal conodont species Palmatolepis triangularis. In goniatite facies, the F-F boundary can be traced by the disappearance of diverse Frasnian conodonts and goniatites of the genus Manticoceras, coupled with the first occurrence of the conodont Pa. triangularis; the sequence shows also the well-known icriodid blooms in the earliest Famennian. Finds of Famennian goniatites (representatives of the genus Cheiloceras) are confined to the crepida zones. In the sections of theWest-Zilair, where the F-F boundary passage consists of siliceous- terrigenous deposits, the boundary can be established only by a change in conodont assemblages. In all the sections under investigation the F-F boundary level shows a drastic faunal change that corresponds to the global Kellwasser Event.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New data on Caledonian, Alpine-style folding in the Holy Cross Mts., Poland
Autorzy:
Znosko, J.
Tematy:
Caledonian folding
Cambrian
Ordovician
Brzeziny Syncline
Devonian-Cenozoic platform cover
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059266.pdf  Link otwiera się w nowym oknie
Opis:
There has been a century-long debate on the nature of the major orogeny in the Holy Cross Mts. Some research workers consider that they were folded during the Variscan orogeny, and that Caledonian movements were responsible only for the formation of mesostructures. Others provide evidence for great folding movements and detachments, suggesting that strong Caledonian compression formed or "squeezed out" Ordovician-Silurian synclines; they consider Variscan deformation to be of platform-type. Laramide and Late Alpine platform-type faults also deformed the Holy Cross Mts. Ordovician haematites show 3 generations of folds in the Brzeziny Syncline, showing it to be over 250 m in amplitude. This structure is thus not a mesostructure but a large-scale structure formed as a result of orogenic compression. The Devonian-Carboniferous cover shows a platform tectonic style. Differences in style between the folded Cambro-Silurian basement and the unconformably overlying Devonian-Carboniferous sedimentary cover are great and cannot be explained in terms of different rock competence. These tectonic relationships are supported by borehole and geophysical evidence. The Caledonian faulting style is identical in the southern part of the Holy Cross Mts. and the northern Łysogóry area. Laramide and Late Alpine stresses are likely related to Atlantic ocean-floor spreading; stresses acting on the crystalline margin of the East European Craton rejuvenated tectonic lineaments in the Holy Cross Mts. and deformed the Devonian-Cenozoic cover throughout the Polish Lowlands.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Devonian history of diversity of the rugosan Cyathaxonia fauna
Autorzy:
Wrzolek, T
Tematy:
stratigraphy
fauna
history
Givetian-Frasnian crisis
Cyathaxonia
diversity
Devonian
paleontology
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/21945.pdf  Link otwiera się w nowym oknie
Opis:
Literature data indicate above average diversity of the Cyathaxonia fauna in the Devonian period,both in absolute numbers of (sub)families and genera per age and also with respect to taxonomic diversities as calculated per Ma (10⁶ years). The Emsian and Famennian faunas,although represented by most numerous (sub)families and genera,have less than average diversities,due to their more than average durations,whereas the shorter intervals of the Pragian and Givetian have the highest values for diversity per Ma,and Frasnian faunas the lowest diversities,for both (sub)families and genera. The post−Givetian crisis may have been responsible for the Frasnian minimum,although limited temporal resolution of the analysis does not allow for a more precise description of the Givetian/Frasnian transition. However,“silent taxa” are extremely numerous in the Frasnian,i.e.,taxa which are present both prior to and after the Frasnian,but missing from the Frasnian record itself indicating that the Famennian Cyathaxonia fauna contains significant numbers of Lazarus and/or Elvis taxa.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Givetian (Middle Devonian) sharks from Cairo, New York (USA): Evidence of early cosmopolitanism
Autorzy:
Potvin-Leduc, D.
Cloutier, R.
Landing, E.
Hernick, L.V.
Mannolini, F.
Tematy:
Chondrichthyes
Elasmobranchii
Antarctilamnidae
Omalodontiformes
taxonomy
ontogenesis
paleobiogeography
Devonian
North America
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/945591.pdf  Link otwiera się w nowym oknie
Opis:
Whereas cosmopolitan distribution patterns are established for many Late Devonian vertebrates (e.g., placoderms, onychodontiforms), few palaeobiogeographic studies have considered chondrichthyans. Recent discoveries of shark material demonstrate that some chondrichthyans were cosmopolitan by the Middle Devonian. Abundant Givetian microremains have been recovered from the Cairo quarry in eastern New York State, USA. These include teeth of two shark species with Gondwanan affinities, the omalodontid Portalodus mannoliniae sp. nov. and the antarctilamnid Wellerodus priscus. Abundant teeth of P. mannoliniae sp. nov. are characterized by a smooth diplodont crown, polarized cusps, and a labially oriented base. The teeth demonstrate monognathic heterodonty. The juvenile morph is distinguished from the adult by smaller size, slender cusps, and variation in the shape of the base. W. priscus is represented by rare juvenile teeth. Two groups of scales that show affinity to material from northern (Spain) and East Gondwana (Antarctica) are tentatively attributed to the two described species. Antarctilamnid distribution suggests a north Gondwanan origin and a colonization of the margin of the landmass before dispersing to Laurentia by the Middle Devonian. This material further indicates that vertebrate global dispersal was initiated by the Middle Devonian, and emphasizes earlier palaeogeographic interpretations that the Middle Devonian “Hamilton fauna” of North American Laurussia originated in the Early Devonian in South American Gondwana.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new Middle Devonian (Givetian) psammosteid (Vertebrata : Heterostraci) from Poland
Autorzy:
Dec, Marek
Tematy:
Pteraspidomorphi
Heterostraci
Psammosteidae
Middle Devonian
Holy Cross Mountains
Manuscript received
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/1836358.pdf  Link otwiera się w nowym oknie
Opis:
A new genus and species of psammosteid heterostracan, Psarkosteus mediocris gen. et sp. nov., is described from the Middle Devonian (Givetian) of the Skały Formation, the Holy Cross Mountains, Poland. The dorsal plate of Psarkosteus is constricted in its anterior part and the postorbital plate is long and narrow. Both features, along with the morphology and variety of tubercles, distinguish it from other representatives of the group. Most distinctive are big, teardrop-shaped tubercles, each with a flat or slightly concave surface and with its tip directed posteriorly, and a crenulated base, located along the branchial plates. The lateral line system in Psarkosteus is similar to that of Drepanaspis gemuendenensis and confirms earlier reconstructions.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pre-Taghanic (Lower to lower Middle Givetian) brachiopods from Miłoszów in the Holy Cross Mountains (Poland)
Autorzy:
Baliński, Andrzej
Halamski, Adam T.
Tematy:
systematics
evolution
palaeoecology
benthic assemblage
biodiversity
brachiopodetum
Devonian
Taghanic Bioevent
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/2200632.pdf  Link otwiera się w nowym oknie
Opis:
Sixty-eight brachiopod species are reported from the upper part of the Skały Formation at Miłoszów (Łysogóry Region of the Holy Cross Mts., central Poland) on the basis of over 2,200 specimens. The fauna is Early to early Middle Givetian in age (timorensis to rhenanus/varcus conodont zones) and thus predates the Middle Givetian Taghanic Bioevent. One new genus and three new species are described. Leiocyrtia Baliński gen. nov. (type species: Leiocyrtia rara Baliński gen. et sp. nov.; Spiriferida, Cyrtiidae) is characterised by a non-costate shell with prominent sulcus and fold and capillate microornament. Undispirifer sidoniae Halamski and Baliński sp. nov. is characterised by transverse shells and dense ribbing. Moravilla andreae Baliński and Halamski sp. nov. is characterised by relatively coarse radial capillate ornament and is the first representative of the genus outside the type species from the Givetian of Moravia. The most abundant species are: Spinulicosta cf. spinulicosta, Antirhynchonella linguiformis, Pentamerelloides davidsoni, Peratos beyrichi, Plectospira ferita, Spinatrypa wotanica (confirmed to belong to that genus and not to Spinatrypina), Ambothyris sp., and Echinocoelia dorsoplana. ‘Spirifer’ quadriplicatus Sandberger and Sandberger, 1856, a rare species known from Miłoszów and the Rhenish Massif, is an orthide and belongs to Teichertina. The relationship between Skenidioides polonicus and S. cretus, formerly understood as anagenesis, is re-interpreted as budding cladogenesis. Davidsonia septata is reported as an epizoan on rugosan corals, a relationship never previously observed in representatives of that genus. Brachiopods represent different palaeoecological groupings, from relatively shallow-water taxa (BA3, globetum) to deep-water mud-dwelling ones (BA5, deeper brachiopodetum). The richest beds are M1-IIa (28 brachiopod species), M3-7 (23 species), and M0-9 (22 species). Eighteen species described here were not known previously in the Holy Cross Mountains, so the corrected total number of brachiopod species from the Middle Devonian of the Łysogóry Region is 140.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A microanatomical and histological study of the postcranial dermal skeleton in the Devonian sarcopterygian Eusthenopteron foordi
Autorzy:
Zylberberg, L
Meunier, F.J.
Laurin, M.
Tematy:
paleontology
microanatomical study
histology
postcranial dermal skeleton
Devonian
sarcopterygian
Eusthenopteron foordi
Sarcopterygii
Tetrapodomorpha
Tristichopteridae
Eusthenopteron
elasmoid scale
paleohistology
transmission electron microscopy
Late Devonian
Frasnian
fossil record
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/20289.pdf  Link otwiera się w nowym oknie
Opis:
The fin rays and two types of scales (enlarged and regular) of the Devonian sarcopterygian Eusthenopteron foordi are redescribed using light, scanning and transmission electron microscopy. The fin rays consist of lepidotrichia composed of ossified, jointed and branched segment pairs. The basal segments are cylindrical, but more distal elements are crescentic in section. The distribution of Sharpey’s fibres varies along the lepidotrichia. In the proximal segments, lateral bundles form a belt connecting adjacent hemisegments. In the distal segments, thin bundles are restricted to the area facing the fin surface. Both enlarged and regular scales have a similar spatial organisation. They are composed of a superficial highly mineralised layer covering a thick basal plate where the fibrils are distributed in superimposed strata forming a plywood−like structure. Nevertheless, the enlarged and regular scales differ in their shape, in the mineralised tissues of the superficial layer, and in the organisation of the plywood−like structure. The superficial layer of the enlarged scales is composed of parallel−fibered bone covering a deeper layer of woven−fibered bone. The basal plate is made of an orthogonal plywood−like structure. The thin, lamellar, imbricated regular scales display the characteristics of elasmoid scales. The mineralised tissue forming the superficial layer resembles that of extant teleost scales. In the basal plate, the twisted plywood−like structure is composed of closely packed fibrils that are preserved down to the ultrastructural level owing to the persistence of bridges connecting the fibrils. The enlarged and the regular scales of Eusthenopteron foordi do not present superficial odontodes, in contrast to ancestral thick rhomboid scales. The disappearance of enamel/enameloid and dentine may be related to the evolutionary trend towards a lightening of the dermal skeleton that would improve the swimming abilities of the animal. The characteristics of the dermal skeleton of Eusthenopteron foordi support the hypothesis that this process began early in osteichthyans.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spore stratigraphy of Lower Devonian and Eifelian (?), alluvial and marginal marine deposits of the Radom-Lublin area (central Poland)
Stratygrafia sporowa aluwialnych i przybrzeżnomorskich utworów dolnego dewonu i eiflu (?) obszaru radomsko-lubelskiego
Autorzy:
Turnau, E.
Miłaczewski, L.
Wood, G. D.
Tematy:
spore stratigraphy
Oppel zones
Lower Devonian
Eifelian
Radom-Lublin area
Polska
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/191950.pdf  Link otwiera się w nowym oknie
Opis:
The Czarnolas and Zwoleń Formations of the Terebin IG 5 borehole, and the Terrigenous suite of the Giełczew PIG 5 borehole were analyzed for their spores. Palynological slides from a previous study of the Czarnolas Formation from the Pionki 4 borehole were re-examined and re-interpreted based on new observations and recent spore zonation publications. Two new cryptospores (Cymbohilates pusillus n. sp., Cymbohilates baculatus n. sp.) and two new trilete spores (Retusotriletes niger n. sp., Retusotriletes tuberiferus n. sp.) are described and illustrated. The Lower Devonian and probable Eifelian spore assemblages are assigned to Streelispora newportensis- Emphanisporites micrornatus (NM), Verrucosisporites polygonalis-Dibolisporites wetteldorfensis (PoW), Emphanisporites foveolatus-Verruciretusispora dubia (FD), and Acinosporites apiculatus-Calyptosporites proteus (AP) Oppel zones. These zones have been recognized in the Ardenne-Rhine regions. These data can also be compared to worldwide eustatic signatures. The spore data indicate that in the Radom-Lublin area marine sedimentation ended in either late early or early late Lochkovian, and the successive flooding commenced in late Emsian, probably the serotinus chron.
Utwory dewońskie obszaru radomsko-lubelskiego występują w obrębie brzeżnej części platformy wschodnioeuropejskiej. Można tu wyróżnić wyraźne, ograniczone uskokami jednostki strukturalne, a to: wyniesiona część platformy (EPEEP), rów mazowiecko-lubelski (MLT) i wyniesienie radomsko-kraśnickie (RKU). Na ościennym terytorium Ukrainy przedłużenie wyniesionej części platformy zwane jest wyniesieniem północno-wołyńskim (NVU) i depresją południowo-wołyńską (SVD), a kontynucja rowu mazowiecko-lubelskiego nosi nazwę rowu lwowskiego (LT) (Fig. 1). Womawianym rejonie obecne są wszystkie trzy oddziały systemu dewońskiego leżące zgodnie na górnym sylurze. Ich podział biostratygraficzny jest wciąż niepełny, szczególnie jeśli chodzi o przybrzeżnomorskie i aluwialne osady nie zawierające diagnostycznej fauny. Celem niniejszej pracy jest przynajmniej częoeciowe wypełnienie tej luki. Przeprowadzone badanie palinologiczne dotyczyły formacji czarnoleskiej i zwoleńskiej z otworu Terebin IG 5 oraz serii terygenicznej z otworu Giełczew PIG 5 (Tabele 1, 2). Formacja czarnoleska i seria terygeniczna reprezentują osady przybrzeżnomorskie, zaś formacja zwoleńska osady aluwialne. Ponownie zbadano zespoły spor z formacji czarnoleskiej z otworu Pionki 4. Uzyskane przed 20 laty wyniki zostały w tej pracy reinterpretowane w oparciu o najnowsze obserwacje i nowsze publikacje dotyczące zonacji sporowej (Fig. 2). Zbadane zespoły były na ogół urozmaicone. Zawierały one zarówno kryptospory, jak i spory ze znakiem zrostowym (por. Figury 3–6). W interpretowaniu uzyskanych wyników badań posłużono się zonacją sporową stworzoną dla dewonu obszaru ardeńsko-reńskiego. Wyróżniono szereg zon Oppla oraz zon filogenetycznych lub interwałowych (Fig. 2). Górną część formacji czarnoleskiej (Terebin IG 5 i Pionki 4) zaliczono do zony Oppla Streelispora newportensis-Emphanisporites micrornatus (NM), zony filogenetycznej M (górna część dolnego lochkowu lub dolna część górnego lochkowu). Dolną część formacji zwoleńskiej (Terebin IG 5) zaliczono również do zony Oppla NM, zony ewolucyjnej Si (dolna częoeć górnego lochkowu). Górna częoeć formacji zwoleńskiej (Terebin IG 5) należy do zony Oppla Verrucosisporites polygonalis-Dibolisporites wetteldorfensis (PoW), zon interwałowych W i Su (prag, być może także najniższy ems). Seria terygeniczna (Giełczew PIG 5) należy do zon Oppla Emphanisporites foveolatus-Verruciretusispora dubia (FD) górnego emsu i Acinosporites apiculatus-Calyptosporites proteus (AP), obejmującej pogranicze ems/eifel. Uzyskane wyniki pozwalają na wysunięcie następujących stwierdzeń: 1. Górna część formacji czarnoleskiej (Pionki 4 i Terebin IG 5) reprezentuje ostatni etap sedymentacji morskiej, zakończonej w późnym wczesnym lochkowie (lub wczesnym późnym lochkowie). 2. Formacja zwoleńska (Terebin IG 5) zawiera utwory górnego lochkowu po prag lub najniższy ems. W tym rejonie brakuje znacznej części osadów emsu obecnych w rejonie Radomia (Pionki 1, 4, Ciepielów IG 1) 3. Seria terygeniczna (Giełczew PIG 5) należy do górnego emsu i (prawdopodobnie) dolnego eiflu. Początek sedymentacji morskiej w tym rejonie można datować pośrednio jako poziom konodontowy serotinus. Dolna granica tej serii odpowiada więc dolnej granicy formacji grzegorzowickiej i jej odpowiedników w Górach Świętokrzyskich. Zatem cykl transgresywnoregresywny II Narkiewicza et al. (1998) odpowiada cyklowi Ic Johnsona et al. (1985).
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Source rock geochemistry, petrography of reservoir horizons and origin of natural gas in the Devonian of the Lublin and Lviv basins (SE Poland and western Ukraine)
Autorzy:
Radkovets, N. Y.
Kotarba, M. J.
Wójcik, K.
Tematy:
Devonian
Lublin Basin
Lviv Basin
Rock-Eval pyrolysis
petrography
isotope geochemistry
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2060597.pdf  Link otwiera się w nowym oknie
Opis:
The Rock-Eval source rock characteristics, mineral composition and type-porosity of reservoir horizons, and origin of natural gas in the Devonian of the Lublin and Lviv basins are described. In the Lower Devonian, the TOC content ranges from 0.01 to 1.82 wt.% in the Lublin Basin, and from 0.01 to 0.45 wt.% in the Lviv Basin. Transformation of organic matter varies from immature in the Lochkovian (Lviv Basin) to mature and overmature in the Emsian (Lublin Basin). The organic matter contains mainly Type-II kerogen, and underwent primary and/or secondary oxidation processes. In the Middle Devonian, the TOC content varies from 0.00 to 1.63 wt.% in the Lublin Basin, and from 0.02 to 0.64 to 2.35 wt.% in the Lviv Basin. The organic matter contains mainly Type-II kerogen and is immature in the Givetian of the Lviv Basin and mature in the Eifelian of the Lviv Basin and in the Eifelian and Givetian in the Lublin Basin. In the Upper Devonian, the TOC content is from 0.02 to 2.62 wt.% in the Lublin Basin, and from 0.04 to 1.43 wt.% in the Lviv Basin. Type-II kerogen dominates in both basins. Organic matter is mature in the Upper Devonian in the Lublin Basin and in the Famennian of the Lviv Basin and overmature in the Frasnian of the Lviv Basin. The reservoir horizons in the Devonian of the Lublin and Lviv basins are developed in clastic, carbonate and sulphate rocks. Terrigenous rocks form several separate horizons in the Lower and Middle Devonian of the Lviv Basin, and in the Upper Devonian (Famennian) of the Lublin Basin. Their filtration properties relate to intergranular porosity, while the fracture space has subordinate significance. Carbonate rocks form thick saturated horizons in the Givetian in the Lviv Basin, and in the Eifelian, Givetian and Frasnian in the Lublin Basin. Their filtration properties are produced by fracture porosity. Sulphates and carbonate-sulphate rocks with fracture and cavern porosity play a role as reservoir horizons in the Middle Devonian of the Lublin Basin. The natural gas collected from the Upper Devonian of the Lublin Basin was generated mainly during low-temperature thermogenic processes, from Ordovician–Silurian Type-II kerogen. The gas from the Middle Devonian reservoirs of the Lviv Basin was produced from Ordovician–Silurian Type-II kerogen and partly from the Middle and Upper Devonian mixed Type-III/II kerogen with maturity from about 0.9 to 1.4%. Carbon dioxide was formed by both thermogenic and microbial processes. Molecular nitrogen was generated mainly through thermal transformation of organic matter and also from destruction of NH4-rich illite of the clayey facies of the Ordovician–Silurian strata.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geological setting of the Milejowice-Janowice diabase intrusion: insights into post-Caledonian magmatism in the Holy Cross Mts., Poland
Autorzy:
Kowalczewski, Z.
Tematy:
Holy Cross Mountains
Łysogóry unit
Early Devonian
magnetic anomaly
diabase intrusion
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2058772.pdf  Link otwiera się w nowym oknie
Opis:
Near Milejowice and Janowice in the eastern part of the Łysogóry Unit of the Holy Cross Mts., Poland, a SW-NE trending diabase has been identified intruding Lower Palaeozoic strata. This intrusion causes amagnetic anomaly, with delta T values of 48-112 gamma. It is orientated perpendicular to the regional strike. Boreholes encountered one to three component dykes 2.0 to more than 10.0 m thick inclined at 75-90 degrees Celsius, generally towards the east. They are hydrothermally altered and affected by surface weathering. The intrusion is located along two independent transverse faults, "skipping" from one to another irrespective of their strike. The intrusive zone is strongly tectonically disturbed, S-curved and disrupted by faults into segments and sub-segments. Most of the diabases are slicken-sided, and locally cataclased and mylonitized. The Milejowice-Janowice diabases probably formed in the Early Devonian, i.e. late Lochkovian-early Pragian, as post-tectonic igneous rocks belonging to within-plate, continental basalts according to Krzemiński (2004). Their origin may be referred tomagmatism triggered by the extension of the Baltica passivemargin during the final Late Silurian-Early Devonian phase of its collision with eastern Avalonia. A complex and at least two-phase development ofmagmatism in the Holy Cross Mts. is envisaged.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gamma-ray and magnetic susceptibility correlation across a Frasnian carbonate platform and the search for "punctata" equivalents in stromatoporoid-coral limestone facies of Moravia
Autorzy:
Geršl, M.
Hladil, J.
Tematy:
Moravian Karst
Devonian
limestones
stratigraphy
natural gamma-ray activity
magnetic susceptibility
Pokaż więcej
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2058866.pdf  Link otwiera się w nowym oknie
Opis:
A comparison of the HV-105 Křtiny gamma-ray log (carbonate platform margin and proximal slope, thickness of Frasnian beds ~270 m) with the three times thinner gamma-ray spectrometric section from Mokrá (inner platform, Frasnian ~93.5m) has significantly increased the reliability of stratigraphic correlation between the outer and inner platform areas, i.e. it has allowed strengthening of the detailed links between conodont-bearing and barren sequences. The detailed gamma-ray and magnetic susceptibility patterns also provide promising clues which might help trace the "punctata Zone" stratigraphic equivalents, located far in the interior of the platform stromatoporoid-coral facies.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A revision of the Devonian rugosan phillipsastreid genus Smithicyathus
Autorzy:
Wrzolek, T
Tematy:
variability
Smithicyathus
Frasnian
Rugosa
fossil coral
Devonian
rugose coral
Phillipsastreidae
paleontology
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/20175.pdf  Link otwiera się w nowym oknie
Opis:
The rugose coral genus Smithicyathus is diagnosed in this paper as massive to phaceloid phillipsastreid, with common horseshoe dissepiments and major septa that are very short in the tabularium. Revised taxonomy of this genus is based on analysis of over 20 numerical characters measured in sections and/or extracted from the literature data. Species are distinguished either by morphometric non−overlap in at least one, key feature or by geographic–stratigraphic isolation. The earliest possible representatives of the genus are known from the Eifelian of Angara (S.? emendatus and S.? russakovi). In the Upper Frasnian Smithicyathus is represented by seven species; in western Euramerica occur S. cinctus and S. mcleani sp. nov.; south−eastern Euramerican shelf area is with S. lacunosus, S. cf. lacunosus, S. smithi, S. cf. smithi, and S. lubliniensis; one probable species is recorded in Angara: S.? belkovskiense. The genus did not survive the Frasnian– Famennian crisis. Smithicyathus lived in tropical and sub−tropical shallow−marine carbonate environments, with the possible exception of the northern mid−latitudes species from Siberia. In the Holy Cross Mountains, S. lacunosus and S. smithi show a preference for restricted−marine facies. They may make up over 90% of all rugosan colonies collected in such locations, whereas in the more open−marine settings they are rare both in numbers and in proportion to other rugosan species.
Dostawca treści:
Biblioteka Nauki
Artykuł
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