- Tytuł:
- First report on dinosaur tracks from the Burro Canyon Formation, San Juan County, Utah, USA : evidence of a diverse, hitherto unknown Lower Cretaceous dinosaur fauna
- Autorzy:
-
Milàn, J.
Chiappe, L. M.
Loope, D. B.
Kirkland, J. I.
Lockley, M. G. - Tematy:
-
dinosaur tracks
Lower Cretaceous
Barremian
Utah
pathology
dinosaur fauna - Pokaż więcej
- Wydawca:
- Polskie Towarzystwo Geologiczne
- Powiązania:
- https://bibliotekanauki.pl/articles/191615.pdf Link otwiera się w nowym oknie
- Opis:
- The newly discovered White Mesa tracksite in the Burro Canyon Formation represents a snapshot of a diverse, Lower Cretaceous dinosaur fauna from south-eastern Utah. The tracks were found at a construction site where the sandstone had been bulldozed and broken up. All tracks were found as deep, well-preserved natural casts on the underside of the sandstone slabs. Individual theropod tracks are 19–57 cm in length; one peculiar track shows evidence of a possible pathological swelling in the middle of digit III and an apparently didactyl track is tentatively assigned to a dromaeosaurid. Individual sauropod tracks are found with pes lengths of 36–72 cm, and interestingly, three distinct shapes of manus tracks, ranging from wide banana shaped to rounded and hoof-like. Ornithopods are represented with individual tracks 18–37 cm in length; a sin gle track can possibly be attributed to the thyreophoran ichnogenus Deltapodus. Zircon U-Pb dating places the track-bearing layer in the Barremian, contemporary to the lower Yellow Cat Member of the Cedar Mountain Formation, which has a similar faunal composition based on both tracks and body fossils. This new track-fauna demonstrates the existence of a diverse dinosaurian assemblage in the lower part of the Burro Canyon Formation, which hitherto is not known to yield skeletalre mains.
- Dostawca treści:
- Biblioteka Nauki
Artykuł