Coordinates: 44°12′N 102°42′E / 44.2°N 102.7°E / 44.2; 102.7

Öösh Formation

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Öösh Formation
Stratigraphic range: Berriasian-Barremian
~141–125 Ma
TypeGeological formation
Sub-unitsCannonball beds
UnderliesBasalt
OverliesBasement
Thickness600 m (2,000 ft)
Lithology
PrimarySandstone, claystone, shale
OtherSiltstone
Location
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Approximate paleocoordinatesLua error: callParserFunction: function "#coordinates" was not found.
RegionOvorkhangai
CountryMongolia

The Öösh Formation, also known as the Tevsh Formation is a geological formation of Lower Cretaceous strata in Övörkhangai Province, Mongolia. Dinosaur remains are among the fossils that have been recovered from the formation.[1] It overlies folded and metamorphosed basement strata of the Gobi region, and is capped by basalt. The succession is around 600 metres thick and consists of red claystones and sandstones, along with black thinly laminated shales. The claystones and sandstones were deposited as part of an alluvial fan system, while the shales were deposited in lakes present in the foot of the fan.[2] Many of the fossils come from the "Cannonball beds", which comprise the lowest 60 metres of the unit and consist of green siltstone.[2]

Vertebrate paleofauna

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Dinosaurs

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Dinosaurs of the Öösh Formation
Genus Species Location Stratigraphic position Material Notes Images
Asiatosaurus A. mongoliensis Teeth Indeterminate sauropod
Halszkaraptorinae indet.[3] ISMD-VP09, preserving a maxillary fragment, two teeth, and partial appendicular elements Halszkaraptorine[4]
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
File:Psittacosaurus stomach stones.jpg
Psittacosaurus fossil from the Hühteeg Svita with gastroliths in its stomach region, American Museum of Natural History
P. protiguanodonensis Junior synonym of P. mongoliensis
Shanag[5] S. ashile[5] Upper and lower jaw fragment (IGM 100/1119) A paravian, possibly a dromaeosaur
File:Shanag skull.png

Mammals

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Mammals of the Öösh Formation
Genus Species Location Stratigraphic position Material Notes Images
Gobiconodon[6] G. hopsoni[6] Cannonball Member of Öösh Formation, possibly equivalent of Tevsh Formation Two upper and lower jaws (PSS-MAE 140 (Holotype) & PSS-MAE 139)
File:GobiconodonDB15.jpg

Pterosaurs

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Pterosaurs of the Öösh Formation
Genus Species Location Stratigraphic position Material Notes Images
Indeterminate tapejaroid[2][7] "Single cervical vertebra (IGM 100/1321)"[2]

Squamates

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Squamates of the Öösh Formation
Genus Species Location Stratigraphic position Material Notes Images
Norellius[8] N. nyctisaurops "Nearly complete skull with mandibles and partial hyoid" Gekkonomorph
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.

See also

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References

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  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. Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value)..
  2. ^ a b c d 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. [1]
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