Earth:Ulansuhai Formation
| Ulansuhai Formation Stratigraphic range: Late Cretaceous, ?Santonian–Campanian (younger than ~92 Ma[1]) | |
|---|---|
| Type | Geological formation |
| Unit of | Dashuigou Group |
| Lithology | |
| Primary | Claystone, siltstone |
| Location | |
| Coordinates | [ ⚑ ] : 40°18′N 105°54′E / 40.3°N 105.9°E |
| Paleocoordinates | [ ⚑ ] 41°30′N 97°12′E / 41.5°N 97.2°E |
| Region | Inner Mongolia |
| Country | China |
  Ulansuhai Formation (China)  Ulansuhai Formation (Inner Mongolia) | |
The Ulansuhai Formation (simplified Chinese: 乌兰苏海组; traditional Chinese: 烏蘭蘇海組; pinyin: Wūlánsūhǎi Zǔ) is a geological formation in Inner Mongolia, north China. Dinosaur remains are among the fossils that have been recovered from the formation.[2]
The Ulansuhai Formation has traditionally been considered to date to the Aptian-Albian stages of the Lower Cretaceous, due to similarities between the Ulansuhai fauna and known Aptian formations.[2] However, radiometric dating done on underlying formations has shown this to be incorrect. Due to the age of underlying rocks, the Ulansuhai Formation cannot be older than the Turonian stage of the Late Cretaceous, about 92 Ma.[3][4] Evans et al. (2021) suggested that the formation is likely dated to the Santonian-Campanian ages or older, but younger than 92 million years ago.[1]
Fossil content
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Dinosaurs
Ornithischians
| Ornithischians of the Ulansuhai Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Iguanodontia indet.[2] | Indeterminate | An indeterminate iguanodontian. | ||||
| Sinocephale[1] | S. bexelli | Skull fragments. | A pachycephalosaurine pachycephalosaurid | |||
Theropods
| Theropods of the Ulansuhai Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Chilantaisaurus[4][5][2] | C. tashuikouensis | Fragmentary postcranial skeleton. | A tetanuran theropod |  | ||
| Sinornithomimus[6][2][7] | S. dongi | "[Fourteen] skeletons, juvenile to adult". | A ornithomimid ornithomimosaur |  | ||
Turtles
| Turtles of the Ulansuhai Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Kuhnemys[8] | K. maortuensis | A pan-trionychid turtle | ||||
Crustaceans
| Crustaceans of the Ulansuhai Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| cf. Cyprididae Indet.[6] | Indeterminate | A cypridid ostracod | ||||
See also
- List of dinosaur-bearing rock formations
References
- ↑ 1.0 1.1 1.2 Evans, David; Brown, Caleb M.; You, Hailu; Campione, Nicolás E. (2021). "Description and revised diagnosis of Asia's first recorded pachycephalosaurid, Sinocephale bexelli gen. nov., from the Upper Cretaceous of Inner Mongolia, China". Canadian Journal of Earth Sciences 58 (10): 981–992. doi:10.1139/cjes-2020-0190. https://cdnsciencepub.com/doi/full/10.1139/cjes-2020-0190.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ Kobayashi, Y., and Lu, J.-C. (2003). "A new ornithomimid dinosaurian with gregarious habits from the Late Cretaceous of China." Acta Palaeontol. Pol., 48: 235–259.
- ↑ 4.0 4.1 Benson, R.B.J. and Xu, X. (2008). "The anatomy and systematic position of the theropod dinosaur Chilantaisaurus tashuikouensis Hu, 1964 from the Early Cretaceous of Alanshan, People's Republic of China." Geol. Mag., 145: 778–789. doi:10.1017/S0016756808005475
- ↑ "Table 4.1," in Weishampel, et al. (2004). Page 73.
- ↑ 6.0 6.1 Kobayashi and Lu, Yoshitsugu and Jun-Chang (2003). "A new ornithomimid dinosaur with gregarious habits from the Late Cretaceous of China". Acta Palaeontologica Polonica 48 (2): 235–259. https://www.researchgate.net/publication/254961054.
- ↑ "Table 5.1," in Weishampel, et al. (2004). Page 138.
- ↑ S.-Y. Hu. 1964. [Carnosaurian remains from Alashan, Inner Mongolia]. Vertebrata PalAsiatica. 8(1):42-63
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