Zhinst Tolgoi, Udyn Sayr [HMNS-GIN] (Cretaceous of Mongolia)

Also known as Udan Sayr,

Where: Omnogov, Mongolia (44.1° N, 102.9° E: paleocoordinates 41.6° N, 92.1° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Djadokhta Formation, Campanian (83.6 - 72.1 Ma)

• upper horizon

• group of beds-level stratigraphic resolution

Environment/lithology: dune; fine-grained, nodular, red sandstone

• "fine sandstone…characterized by large-scaled, steeply-dipping cross-stratification". "Fossiliferous beds are made of fine sandstone including many calcarous nodules"

Size classes: macrofossils, mesofossils

Preservation: concretion

Collected by HMNS-GIN in 1995, 1998, 2005, 2007

Collection methods: surface (in situ), mechanical,

• HMNS-Hayashibara Museum of Natural Sciences

Primary reference: S. Suzuki and M. Watabe. 2000. Report on the Japan-Mongolia Joint Paleontological Expedition to the Gobi desert, 1995. Hayashibara Museum of Natural Sciences Research Bulletin 1:45-57 [R. Benson/R. Benson/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 127678: authorized by Roger Benson, entered by Roger Benson on 22.05.2012, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Testudinata -
Testudinata indet.5 Oppel 1811 turtle
turtle carapaces were found at southern outcrops (outcrop no. 37)
 Testudines - Nanhsiungchelyidae
Nanhsiungchelyidae indet.2 Yeh 1966 turtle
fragmentary remains
cf. Basilemys sp.5 Hay 1902 turtle
carapace
 Dinosauria -
Dinosauria indet.3 Owen 1842 dinosaur
980819 US Egg Nest B-O, 000719 US FJ, 070626 US SZK; At outcrop no. 41 (S of no. 39), eggshells
  - Prismatoolithidae
Protoceratopsidovum sp. Mikhailov 1994 dinosaur
950704 Zhinst SZK; nest with eggs
 Saurischia -
Theropoda indet.3 Marsh 1881 theropod
000722 US BON; "small theropod pelvis-hind limb specimen"; isolated bones - theropod digits
 Avetheropoda - Dromaeosauridae
Velociraptor sp.3 Osborn 1924 coelurosaur
forelimbs; teeth of Velociraptor: outcrops in the SE area of Udyn Sayr
 Saurischia - Elongatoolithidae
Elongatoolithidae indet.3 Zhao 1975 theropod
 Ornithischia - Ankylosauridae
Ankylosauridae indet.5 Brown 1908 ornithischian
000716 US ENKH-ANKLYO, 000717 US ENKH-ANKYLO, 000718 US BON; ankylosaur scutes and vertebrae, and a small skull of ankylosaurwere found at southern outcrops (outcrop no. 37)
? Pinacosaurus sp.3 Gilmore 1933 ornithischian
partial skeleton, only incompletely excavated
Pinacosaurus sp.5 Gilmore 1933 ornithischian
On July 16 the skeleton of a small individual ankylosaur (Pinacosaurus) found by Mongolian preparator Enkhbat in 1998 was excavated by the monolith method at the southern small outcrop of eolian deposits (no. 34)
 Neornithischia - Protoceratopsidae
Protoceratopsidae indet.5 Granger and Gregory 1923 ornithischian
000723 US BON; "a robust jaw of a protoceratopsid"; At outcrop no. 41 (S of no. 39), teeth and partial skeletons of a protoceratopsid
 Neornithischia -
Protoceratops sp.4 Granger and Gregory 1923 ornithischian
MPC-D 100/540a-d (= 070626 US KWR); 980819 US Proto NAR; 980821 US SZK 9:05; 000720 US SZK Proto; 000720 US TSGT small Proto
Protoceratops andrewsi1 Granger and Gregory 1923 ornithischian
MPC-D 100/537, 100/539 (= 980821 US Proto ENKH?)
Protoceratops cf. andrewsi1 Granger and Gregory 1923 ornithischian
MPC-D 100/538
Bagaceratops sp.5 Maryanska and Osmólska 1975 ornithischian
000719 US FJM Baga; At outcrop no. 41 (S of no. 39), a well-preserved skeleton of a Bagaceratops: field no. 000720-US
 Neornithischia - Ovaloolithidae
Ovaloolithidae indet.3 Mikhailov 1991 bird foot dinosaur
eggs
 Crocodylia -
Crocodylia indet.5 Owen 1842 crocodilian
000722 US SZK Croco; "an infant crocodile"
 Squamata -
Varanoidea indet.5 Gray 1827 lizard
outcrop no. 52, isolated bones from the skeleton of a varanoid lizard
Lacertilia indet.4 lizard
000725 US OTG LIZARD-1, LIZARD-2; skull of a lizard; a lizard skeleton with scales; 980818 US Lizard ENKH, 980818-21 US
Mammalia
 Tribosphenida -
? Eutheria indet.3 eutherian
980818-21 US
 Multituberculata -
Multituberculata indet.3 multituberculate
At outcrop no. 41 (S of no. 39), and lower jaw and postcranial elements of a Multituberculata, 980817 US Mammal LKH