Oosh Formation

Öösh Formation
Stratigraphic range: Berriasian-Barremian
~141–125 Ma

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Öösh Formation; Stratigraphic range: Berriasian-Barremian; ~141–125 Ma PreЄ Є O S D C P T J K Pg N
Type	Geological formation
Sub-units	Cannonball Member
Thickness	Over 800 m (2,600 ft)
Lithology
Primary	Sandstone, conglomerate, siltstone, mudstone
Location
Region	Asia
Country	Mongolia

The Öösh Formation is a geological formation in Mongolia whose strata date back to the Early Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.[1]

Vertebrate paleofauna

Dinosaurs

Color key

Taxon	Reclassified taxon	Taxon falsely reported as present	Dubious taxon or junior synonym	Ichnotaxon	Ootaxon	Morphotaxon

Notes
Uncertain or tentative taxa are in small text; ~~crossed out~~ taxa are discredited.

Dinosaurs reported from the Öösh Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Asiatosaurus	A. mongoliensis			Teeth.	Indeterminate Sauropod.	Psittacosaurus fossil from the Hühteeg Svita with gastroliths in its stomach region, American Museum of Natural History
Prodeinodon	P. mongoliensis			Several teeth, fragmentary tibia, fragmentary fibula.	Indeterminate Theropod.
Protiguanodon	P. mongoliensis				Reclassified as a species of Psittacosaurus, Psittacosaurus protiguanodonensis.
Psittacosaurus	P. mongoliensis
Psittacosaurus	P. protiguanodonensis				Junior synonym of P. mongoliensis.
Shanag[2]	S. ashile[2]

Mammals

Mammals of the Öösh Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Gobiconodon[3]	G. hopsoni[3]		Cannonball Member of Öösh Formation, possibly equivalent of Tevsh Formation.	Two upper and lower jaws (PSS-MAE 140 (Holotype) & PSS-MAE 139)		Gobiconodon

Pterosaurs

Pterosaurs of the Öösh Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Indeterminate Tapejaroid[4]				"Single Vertebra".[4]

Squamates

Squamates of the Öösh Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Norellius[5]	N. nyctisaurops			"nearly complete skull with mandibles and partial hyoid"	Gekkonomorph

References

Weishampel, David B; et al. (2004). "Dinosaur distribution (Early Cretaceous, Asia)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 563-570. ISBN 0-520-24209-2.
Turner, A.S.; Hwang, S.H.; Norell, M.A. (2007). "A small derived theropod from Öösh, Early Cretaceous, Baykhangor Mongolia" (PDF). American Museum Novitates. 3557 (1): 1–27. doi:10.1206/0003-0082(2007)3557[1:ASDTFS]2.0.CO;2. hdl:2246/5845. Retrieved 2007-03-29.
Kielan-Jaworowska, Z., Dashzeveg, D. (1998). "Early Cretaceous amphilestid ("triconodont") mammals from Mongolia" (PDF). Acta Palaeontologica Polonica. 43 (3): 413–438.CS1 maint: multiple names: authors list (link)
Andres, B. and Norell, M.A. 2005. The first record of a pterosaur from the Early Cretaceous strata of Öösh (Övörkhangai; Mongolia). American Museum Novitates 3472: 1–6.
Conrad, Jack L.; Daza, Juan D. (2015-08-28). "Naming and rediagnosing the Cretaceous gekkonomorph (Reptilia, Squamata) from Öösh (Övörkhangai, Mongolia)". Journal of Vertebrate Paleontology. 35 (5): e980891. doi:10.1080/02724634.2015.980891. ISSN 0272-4634.

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[cretaceousdistribution-1] Weishampel, David B; et al. (2004). "Dinosaur distribution (Early Cretaceous, Asia)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 563-570. ISBN 0-520-24209-2.

[turneretal2007-2] Turner, A.S.; Hwang, S.H.; Norell, M.A. (2007). "A small derived theropod from Öösh, Early Cretaceous, Baykhangor Mongolia" (PDF). American Museum Novitates. 3557 (1): 1–27. doi:10.1206/0003-0082(2007)3557[1:ASDTFS]2.0.CO;2. hdl:2246/5845. Retrieved 2007-03-29.

[Kielan-Jaworowska-3] Kielan-Jaworowska, Z., Dashzeveg, D. (1998). "Early Cretaceous amphilestid ("triconodont") mammals from Mongolia" (PDF). Acta Palaeontologica Polonica. 43 (3): 413–438.CS1 maint: multiple names: authors list (link)

[andres-4] Andres, B. and Norell, M.A. 2005. The first record of a pterosaur from the Early Cretaceous strata of Öösh (Övörkhangai; Mongolia). American Museum Novitates 3472: 1–6.

[5] Conrad, Jack L.; Daza, Juan D. (2015-08-28). "Naming and rediagnosing the Cretaceous gekkonomorph (Reptilia, Squamata) from Öösh (Övörkhangai, Mongolia)". Journal of Vertebrate Paleontology. 35 (5): e980891. doi:10.1080/02724634.2015.980891. ISSN 0272-4634.