Bayshin Tsav II (HMNS-GIN) (Cretaceous to of Mongolia)

Also known as Bayshin-Tsav, BTs-II

Where: Omnogov, Mongolia (43.5° N, 107.8° E: paleocoordinates 45.4° N, 98.2° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Baynshire Formation, Cenomanian to Cenomanian (100.5 - 83.6 Ma)

• Baynshire Suite = Bayn Shire = Baynshiree. Cenomanian to Santonian date is based upon palaeomagnetic analyses (see Watabe et al. 2009)

• bed-level stratigraphic resolution

Environment/lithology: fine channel fill; fine-grained, coarse, white sandstone and gray mudstone

• point-bar deposit in an eolian environment; meandering fluvial system
• "The bone bed is one of the bluish white, fine− to coarse−grained sandstone layers"

Size classes: macrofossils, mesofossils

Collected by HMNS-GIN in 1993–1994, 2001, 2004, 2006

Collection methods: quarrying, mechanical,

Primary reference: M. Watabe and D. B. Weishampel. 1994. Results of Hayashibara Museum of Natural Sciences–Institute of Geology, Academy of Sciences of Mongolia Joint Paleontological Expedition to the Gobi Desert in 1993. Journal of Vertebrate Paleontology 14(3, suppl.):51A [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 55254: authorized by Matthew Carrano, entered by Matthew Carrano on 03.10.2005, edited by Richard Butler and Roger Benson

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Testudinata -
Testudinata indet.8 Oppel 1811 turtle
turtle shells
 Testudines - Adocidae
Adocidae indet.2 Cope 1869 turtle
shell fragments
 Testudines - Lindholmemydidae
Lindholmemydidae indet.2 Chkhikvadze 1970 turtle
shell fragments
 Testudines - Trionychidae
Trionychidae indet.2 Gray 1825 softshell turtle
shell fragments
 Testudines - Nanhsiungchelyidae
Nanhsiungchelyidae indet.2 Yeh 1966 turtle
shell fragments
 Dinosauria -
Dinosauria indet.1 Owen 1842 dinosaur
eggshells; other bones, 040730 BTs-II BD, BD-1, 040731 BTs-II TSGT
 Ornithischia -
Hadrosauroidea indet.8 Huene 1954 ornithopod
an articulated partial skeleton and isolated bone elements of a hadrosaur; 040731 BTs-II KWR
Hadrosauroidea indet.4 Huene 1954 ornithopod
many femora and tibiae; 930820 BTs-II-1, 6, 7, 8, 930820-21 BTs-II-5, 940625 BTs II, 040731 BTs-II KWR, 040731 BTs-II SZK
 Ornithischia - Hadrosauridae
? Hadrosauridae indet.6 Cope 1869 hadrosaurid
left tibia, right femur; 930820 BTs-II-2
 Ornithischia -
Bactrosaurus sp.5 Gilmore 1933 ornithopod
a whole skeleton of young Bactrosaurus
 Theropoda -
Theropoda indet.8 Marsh 1881 theropod
teeth and claws of theropods; 040731 BTs-II
 Theropoda - Troodontidae
Troodontidae indet.3 Gilmore 1924 maniraptoran
field no. 950728-BTs-Nar
 Theropoda - Therizinosauridae
"Segnosauridae indet." = Therizinosauridae7
"Segnosauridae indet." = Therizinosauridae7 Maleev 1954 coelurosaur
lower jaws, partial bones of the skull, cervical vertebrae, L humerus, pubis; Segnosauria; 930820 BTs-II-4, 8; 940625 BTs II
 Theropoda - Ornithomimidae
Ornithomimidae indet.7 Marsh 1890 ornithomimid
2 partial skeletons; field no. 940625-BTs-II
 Theropoda - Tyrannosauridae
Tyrannosauridae indet.6 Osborn 1906 tyrannosaurid
ilium, sacrals; 930820 BTs-II-3 (listed as ornithomimosaur in Matsumoto et al. 2000)
 Saurischia -
 Pterosauria - Azhdarchidae
Azhdarchidae indet.9 pterosaur
MPC-d 100/303, isolated cervical vertebra