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Wyświetlanie 1-10 z 27
Tytuł:
Putative ichnogenus Paralanicichnites Ghare and Badve 1981 from the Palaeogene of the Kachchh Basin (India) is a coral
Autorzy:
Kulkarni, Kantimati G.
Sikilkar, Namra
Tematy:
trace fossil
scleractinian coral
Palaeogene
fossiliferous limestone
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/1836357.pdf  Link otwiera się w nowym oknie
Opis:
Structures, reported as the trace fossil, Paralanicichnites conflueris, were described from the Palaeogene rocks of the Kachchh (Kutch) District, Gujarat State, India, by Ghare and Badve as a new ichnogenus and ichnospecies. Restudy of the type specimens revealed that the form described as a burrow in fact is a scleractinian coral, as evidenced by its phaceloid morphology, septate calcareous exoskeleton, and twelve primary septa. It appears that there is also confusion regarding the exact geological formation, from which the specimens under consideration were taken by the original authors, as well as the age assigned by them.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compaction-related style of Rusophycus preservation from Furongian (Upper Cambrian) of Holy Cross Mountains (Poland)
Autorzy:
Sadlok, G.
Tematy:
Rusophycus
trace fossil
preservation
compaction
Cambrian
Furongian
Polska
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/191759.pdf  Link otwiera się w nowym oknie
Opis:
In general, the trace fossil Rusophycus, preserved as a concave-upward structure on the top of a bed, is considered to be a fossilized marking, made by a trace maker. The structures described from the Cambrian (Furongian) of central Poland are genetically related to Rusophycus. However, despite their occurrence on the tops of beds, they are not fossilized traces, but compaction-related features, resulting from differential sandstone and mudstone compaction with possible mediation by organic-rich, heterolithic sediments. The preservation of these structures probably was influenced by biofilms or biomats.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Short distance variability of trace fossils in submarine slope and proximal basin plain deposits : a case study from the Ceylan Formation (upper Eocene), Gelibolu Peninsula, NW Turkey
Autorzy:
Demírcan, Huriye
Uchman, Alfred
Opis:
The Ceylan Formation (upper Eocene) from the Thrace Basin (Gelibolu Peninsula, NW Turkey), is composed of pelagic shales, marls, clayey limestones, turbiditic sandstone-shale beds and local conglomerates, debris flow mixtites, slumped deposits and silicified tuffites. These deposits, which are about 1000 m thick, generally shallow upwards, show vertical and lateral changes according to their accumulation on different parts of a submarine slope, with a transition to the proximal basin plain. The variability is also expressed in the trace fossil content (33 ichnotaxa, 26 ichnogenera). The fine-grained background sediments are totally bioturbated and they show an ichnofabric with Trichichnus, Chondrites, Planolites and small Thalassinoides. Generally, abundance and diversity of trace fossils increase with frequency of sandstone intercalations, probably because of higher and more variable food content and higher preservational potential. Turbiditic sandstones of the proximal basin plain contain abundant graphoglyptids (Paleodictyon, Helminthorhaphe, Urohelminthoida, Desmograpton, Belorhaphe, Helicolithus). Continuous reworking of background sediments points to a good or moderate oxygenation of pore waters. The trace fossil assemblage of fine-grained pelagic sediments with isolated sandstone beds can be ascribed to the Zoophycos ichnofacies sensu lato, but some ichnotaxa typical of turbiditic sediments (e.g., Ophiomorpha annulata) can be present in isolated sandstone beds. Series of turbiditic sandstones with abundant graphoglyptids are typical of the Paleodictyon ichnosubfacies of the Nereites ichnofacies. Turbiditic series in the upper slope setting contain much fewer graphoglyptids. The absence of graphoglyptids in isolated sandstone beds shows that their occurrence is not only a matter of taphonomy (scouring and casting) but also is related to the presence of more frequent turbidites modifying the substrate.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Parasitic gastropod bioerosion trace fossil on Cenomanian oysters from Le Mans, France and its ichnologic and taphonomic context
Autorzy:
BRETON, GÉRARD
WISSHAK, MAX
NÉRAUDEAU, DIDIER
MOREL, NICOLAS
Tematy:
gastropoda
ostreidae
trace fossil
taphonomy
bioerosion
cenomanian
paris basin
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Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/945407.pdf  Link otwiera się w nowym oknie
Opis:
We describe and name Loxolenichnus stellatocinctus Breton and Wisshak igen. et isp. nov., a bioerosion trace fossil on an Upper Cenomanian oyster from Le Mans (France). This trace is attributed here to a parasitic gastropod. The characteristics of this ichnospecies are a combination of one or several, vertical or oblique, complete penetrations, and an asymmetrical attachment etching (fixichnion) with a diagnostic set of stellate grooves increasingly distinct towards the margin of the trace. By including two former Oichnus ichnospecies, Loxolenichnus halo comb. nov. and Loxolenichnus taddei comb. nov., Oichnus, is now constrained to pure predation traces (praedichnia). The numerous oysters collected from the Marnes à Pycnodonte biauriculata Formation show associated epibionts and encrusters as well as borers and scrapers. Encrusters comprise 24 taxa while bioerosion trace fossils comprise 17 ichnotaxa ranging from very rare (< 0.1%) to quite abundant (81%). The taphonomic history leading to an ex-situ condensation of these oysters is complex. Both the Gnathichnus and Entobia ichnofacies are represented on the shellgrounds, presumably alternatingly.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new Y-shaped trace fossil attributed to upogebiid crustaceans from Early Pleistocene of Italy
Autorzy:
Pervesler, P
Uchman, A.
Tematy:
Psilonichnus
fossil
paleontology
Early Pleistocene
Upogebia
Parmaichnus
trace fossil
crustacean burrow
Pleistocene
Italy
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/22896.pdf  Link otwiera się w nowym oknie
Opis:
Y−shaped trace fossil (U−shaped upper part with a basal shaft), Parmaichnus stironensis igen. nov. et isp. nov. penetrates from a discontinuity surface cut in Early Quaternary mudstones in the Stirone Valley, Northern Italy. It is attributed to upogebiid decapod crustaceans. Parmaichnus differs from Psilonichnus by the presence of turning chambers in the upper part of the burrow. The turning chambers are considered to be an important taxonomic feature of upogebiid burrows. P. stironensis occurs together with Thalassinoides cf. paradoxicus (produced probably by callianassid crustaceans) and wide U−shaped pyritised cylinders (supposedly produced by balanoglossid hemichordates).
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 27

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