Red Mesa, Artsa Bogdo (AMNH Loc. 11492): Early/Lower Cretaceous, Mongolia
collected by W. Granger, Wong 1922-1923

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
Psittacosaurus sp. Osborn 1923
Andrews 1932 2 specimens
Psittacosaurus mongoliensis Osborn 1923
Andrews 1932 2 specimens
baby skulls (AMNH 6535, 6536) (11 measurements)
Reptilia - Theropoda
Prodeinodon mongoliense n. gen., n. sp. Osborn 1924
1 specimen
nomen dubium belonging to Tetanurae
Reptilia
Asiatosaurus mongoliensis n. gen., n. sp. Osborn 1924
nomen dubium belonging to Sauropoda
AMNH 6264 (tooth)
Gekkonomorpha informal unnamed genus and species
Conrad and Norell 2006 1 specimen
AMNH FR 21444 (skull)
    = Norellius nyctisaurops n. gen., n. sp. Conrad and Daza 2015
Conrad and Daza 2015
AMNH FR 21444 - holotype (near-complete skull and mandibles)
see common names

Geography
Country:Mongolia State/province:Ovorkhangai
Coordinates: 44.2° North, 102.7° East (view map)
Paleocoordinates:45.0° North, 103.3° East
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
10 m.y. bin:Cretaceous 1-4
Key time interval:Early/Lower Cretaceous
Age range of interval:145.00000 - 100.50000 m.y. ago
Stratigraphy
Formation:Öösh
Stratigraphic resolution:bed
Stratigraphy comments: originally Ondai Sair Fm.; also called Oshih Fm. = Tevsh Fm.; assigned to the Khukhtekskaya (Hüteeg Svita)

"Although the age remains somewhat uncertain, correlated exposures that appear to be of the same age have been dated at around 130 Ma (Samiolov et al., 1988; Watabe and Suzuki, 2000; Rougier et al., 2001; Prieto-Marquez et al., 2012)" (Conrad and Daza 2015).
Lithology and environment
Primary lithology: not reported
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Degree of concentration:dispersed
Size of fossils:macrofossils,mesofossils
Preservation of anatomical detail:good
Disassociated major elements:some
Fragmentation:occasional
Collection methods and comments
Collection methods:selective quarrying,surface (float),surface (in situ),mechanical,field collection
Reason for describing collection:taxonomic analysis
Museum repositories:AMNH
Collectors:W. Granger, Wong Collection dates:1922-1923
Metadata
Also known as:Oshih Basin, Oosh Basin, Ööshiin Nuur
Database number:48937
Authorizer:M. Carrano, R. Benson, P. Mannion Enterer:M. Carrano, P. Mannion, R. Benson
Modifier:M. Carrano Research group:vertebrate
Created:2005-04-04 11:32:32 Last modified:2019-06-26 13:07:26
Access level:the public Released:2005-04-04 11:32:32
Creative Commons license:CC BY
Reference information

Primary reference:
13097.ETE H. F. Osborn. 1924. Sauropoda and Theropoda from the Lower Cretaceous of Mongolia. American Museum Novitates 128:1-7 [M. Carrano/M. Carrano/M. Carrano]

Secondary references:

13060ETE R. C. Andrews. 1932. The New Conquest of Central Asia: A Narrative of the Explorations of the Central Asiatic Expeditions ni Mongolia and China, 1921-1930. Natural History of Central Asia 1:1-678 [M. Carrano/M. Carrano/M. Carrano]
19215ETE P. M. Barrett, Y. Hasegawa, M. Manabe, S. Isaji, and H. Matsuoka. 2002. Sauropod dinosaurs from the Lower Cretaceous of eastern Asia: taxonomic and biogeographical implications. Palaeontology 45(6):1197-1217 [M. Carrano/M. Carrano]
14221ETE K. Carpenter and K. Alf. 1994. Global distribution of dinosaur eggs, nests, and babies. In K. Carpenter, K. F. Hirsch, and J. R. Horner (eds.), Dinosaur Eggs and Babies, Cambridge University Press, Cambridge 13-30 [M. Carrano/M. Carrano/M. Carrano]
69232 E. H. Colbert. 2000. Asiatic dinosaur rush. In M. J. Benton, M. A. Shishkin, D. M. Unwin, & E N. Kurichkin (eds.), The Age of Dinosaurs in Russia and Mongolia 211-234 [M. Carrano/M. Carrano]
56222 J. L. Conrad and J. D. Daza. 2015. Naming and rediagnosing the Cretaceous gekkonomorph (Reptilia, Squamata) from Öösh (Övörkhangai, Mongolia). Journal of Vertebrate Paleontology 35(5):e980891:1-5 [P. Mannion/P. Mannion/M. Carrano]
37980 J. L. Conrad and M. A. Norell. 2006. High-resolution X-ray computed tomography of an Early Cretaceous gekkonomorph (Squamata) from Öösh (Övöorkhangai; Mongolia). Historical Biology 18(4):405-431 [R. Benson/R. Benson]
17488ETE W. P. Coombs. 1980. Juvenile ceratopsians from Mongolia—the smallest known dinosaur specimens. Nature 283:380-381 [M. Carrano/M. Carrano]
17495ETE W. P. Coombs, Jr. 1982. Juvenile specimens of the ornithischian dinosaur Psittacosaurus. Palaeontology 25(1):89-107 [M. Carrano/M. Carrano]
33967ETE N. N. Kalandadze and S. M. Kurzanov. 1974. Nizhnemelove mestonakhozhdeniya nazemnykh pozvonochnykh Mongolii [Lower Cretaceous terrestrial vertebrate localities of Mongolia]. In N. N. Kramarenko, B. Luvsandansan, Yu. I. Voronin, R. Barsbold, A. K. Rozhdestve (eds.), Mesozoic and Cenozoic Faunas and Biostratigraphy of Mongolia. The Joint Soviet-Mongolian Paleontological Expedition, Transactions 1:288-295 [M. Carrano/M. Carrano/M. Carrano]
18350ETE T. Maryanska. 2000. Sauropods from Mongolia and the former Soviet Union. In M. J. Benton, M. A. Shishkin, D. M. Unwin, & E N. Kurichkin (eds.), The Age of Dinosaurs in Russia and Mongolia 456-461 [M. Carrano/M. Carrano/M. Carrano]
9631 H. F. Osborn. 1924. Psittacosaurus and Protiguanodon: two Lower Cretaceous iguanodonts from Mongolia. American Museum Novitates 127:1-16 [M. Carrano/M. Carrano/M. Carrano]
62839 H. F. Osborn. 1930. Ancient vertebrate life of central Asia: discoveries of the central Asiatic expeditions of the Museum of Natural History in the years 1921–1929. Centenaire de la Société géologique de France. Livre jubilaire 1830-1930 2:519-543 [M. Carrano/M. Carrano]
33412ETE P. C. Sereno. 2010. Taxonomy, cranial morphology, and relationships of parrot-beaked dinosaurs (Ceratopsia: Psittacosaurus). In M. J. Ryan, B. J. Chinnery-Allgeier, D. A. Eberth (eds.), New Perspectives on Horned Dinosaurs: The Royal Tyrrell Museum Ceratopsian Symposium. Indiana University Press, Bloomington 21-58 [M. Carrano/M. Carrano]