Also known as Udan Sayr,
Where: Omnogov, Mongolia (44.1° N, 102.9° E: paleocoordinates 41.6° N, 92.0° E)
• coordinate stated in text
• outcrop-level geographic resolution
When: Djadokhta Formation, Late/Upper Campanian (83.5 - 70.6 Ma)
• -upper horizon
•-possibly Baruungoyot Fm. (Czepinksi 2020)
•-Dashzeveg et al. 2005: The quick stratigraphic succession of normal and reversed magnetozones suggests, but does not clearly establish, that the sediments may have been deposited during the rapid sequence of polarity changes in the late part of the Campanian between about 75 to 71 Ma.
• group of beds-level stratigraphic resolution
Environment/lithology: dune; fine-grained, nodular, red sandstone
Size classes: macrofossils, mesofossils
Preservation: concretion
Collected by HMNS-GIN in 1995, 1998, 2000, 2005, 2007
Collection methods: surface (in situ), mechanical,
• HMNS-Hayashibara Museum of Natural Sciences
Primary reference: Y. Ariunchimeg. 1997. Results of studies of dinosaur eggs. Abstract of Report Meeting, Mongolia-Japan Joint Paleontological Expedition 13 [M. Carrano/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 | |
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Dinosauria indet.5 Owen 1842 dinosaur 980819 US Egg Nest B-O, 000719 US FJ, 070626 US SZK; At outcrop no. 41 (S of no. 39), eggshells
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Theropoda indet.5 Marsh 1881 theropod 000722 US BON; "small theropod pelvis-hind limb specimen"; isolated bones - theropod digits
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Nanhsiungoolithus sp. Zhao 1975 theropod | |
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Velociraptor sp.5 Osborn 1924 maniraptoran forelimbs; teeth of Velociraptor: outcrops in the SE area of Udyn Sayr
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Protoceratopsidae indet.7, Protoceratops sp.6, Protoceratops andrewsi2, Protoceratops cf. andrewsi2, cf. Bagaceratops sp.1
Protoceratopsidae indet.7 Granger and Gregory 1923 ceratopsian 000723 US BON; "a robust jaw of a protoceratopsid"; At outcrop no. 41 (S of no. 39), teeth and partial skeletons of a protoceratopsid
Protoceratops sp.6 Granger and Gregory 1923 ceratopsian MPC-D 100/540a-d (= 070626 US KWR); 950704 Udyn Sayr MTS-I & MTS-II, 980819 US Proto NAR; 980821 US SZK 9:05; 000720 US SZK Proto; 000720 US TSGT small Proto
Protoceratops andrewsi2 Granger and Gregory 1923 ceratopsian MPC-D 100/537, 100/539 (= 980821 US Proto ENKH?); MPC-D 100/551 (= 000720 US-Zhinst, GI SPS 100/588, and 100/528; formerly Bagaceratops)
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Ankylosauridae indet.7 Brown 1908 ankylosaurid 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.7 Gilmore 1933 ankylosaurid 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)
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Varanoidea indet.7 Gray 1827 squamates outcrop no. 52, isolated bones from the skeleton of a varanoid lizard
Lacertilia indet.6 lizard 000725 US OTG LIZARD-1, LIZARD-2; skull of a lizard; a lizard skeleton with scales; 980818 US Lizard ENKH, 980818-21 US
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Testudinata indet.7 Oppel 1811 turtle turtle carapaces were found at southern outcrops (outcrop no. 37)
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| Mammalia | |
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Multituberculata indet.5 multituberculate At outcrop no. 41 (S of no. 39), and lower jaw and postcranial elements of a Multituberculata, 980817 US Mammal LKH
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