Udan-Sayr (PIN Loc. 3907) [MPE/SMPE] (Cretaceous of Mongolia)

Also known as Uuden Sayr, Uuden Sajr, Uuden Sair, Soviet-Mongolian Paleontological Expedition, Udan Sayr, Tüshleg

Where: Omnogov, Mongolia (42.1° N, 102.2° E: paleocoordinates 39.1° N, 91.7° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Djadokhta Formation, Late/Upper Campanian (83.5 - 70.6 Ma)

• Udanoceratops from bed 2

•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: terrestrial; yellow sandstone and lenticular, concretionary, gray, calcareous sandstone

• fossils from "yellow sands" and calcareous concretion in "a lens of dense, dark gray sandstones, strongly calcareous in places"

Size classes: macrofossils, mesofossils

Preservation: concretion

Collected by MPE, SMPE in 1946, 1973, 1980-1985; reposited in the PIN

Collection methods: quarrying, surface (float), surface (in situ),

Primary reference: S. M. Kurzanov. 1981. O neobuchnykh teropodakh iz verkhnego mela MNR [An unusual theropod from the Upper Cretaceous of Mongolia]. Fossil Reptiles of Mongolia. Sovmestnaya Sovetsko-Mongol'skaya Paleontologicheskaya Ekspeditsiya, Trudy [The Joint Soviet-Mongolian Paleontological Expedition, Transactions] 24:39-50 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 65344: authorized by Matthew Carrano, entered by Matthew Carrano on 21.09.2006, edited by Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

Amphibia
 Salientia - Gobiatidae
Gobiates sp.6 Spinar and Tatarinov 1986 frog
PIN 3907/10
Mammalia
 Theriamorpha -
Asiatherium reshetovi n. gen. n. sp.7
Asiatherium reshetovi n. gen. n. sp.7 Trofimov and Szalay 1994 metatherian
PIN 3907
Reptilia
 Loricata - Gobiosuchidae
Gobiosuchus parvus n. sp.1 Efimov 1983 crocodilian
GIN PST 10/22 - type (skull and jaws)
 Loricata - Artzosuchidae
Artzosuchus brachicephalus n. gen. n. sp.1 Efimov 1983 crocodilian
GIN PST 10/23 - holotype (partial skull and set of jaws)
 Ornithischia - Leptoceratopsidae
Udanoceratops tschizhovi n. gen. n. sp.3
Udanoceratops tschizhovi n. gen. n. sp.3 Kurzanov 1992 leptoceratopsid
PIN 3907/11
 Ornithischia - Ovaloolithidae
Ovaloolithidae indet.4 Mikhailov 1991 ornithopod
O2 group; PIN 3097/502
Aves
 Anseriformes - Presbyornithidae
Presbyornithidae indet.2 Wetmore 1926 waterfowl
tarsometatarsus
Reptilia
 Theropoda -
Avimimus portentosus n. gen. n. sp.
Avimimus portentosus n. gen. n. sp. Kurzanov 1981 maniraptoran
PIN 3907/1, 3907/2
 Theropoda - Elongatoolithidae
Elongatoolithus subtitectorius n. sp.5 Mikhailov 1994 theropod
E1 group eggs