Ulansuhai Formation Explained

Ulansuhai Formation
Type:Geological formation
Age:Turonian
~
Period:Turonian
Prilithology:Claystone, siltstone
Region:Inner Mongolia
Country: China
Coordinates:40.3°N 105.9°W
Paleocoordinates:41.5°N 97.2°W
Unitof:Dashuigou Group

The Ulansuhai Formation is a geological formation in Inner Mongolia, north China. Dinosaur remains are among the fossils that have been recovered from the formation.[1]

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.[1] 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.[2] [3]

Fossil content

Dinosaurs

Dinosaurs
TaxaPresenceDescriptionImages
Chilantaisaurus tashuikouensisA primitive coelurosaurian[4] ."Fragmentary postcranial skeleton."[5]
Gobisaurus domoculusAn ankylosaur. "Skull [and possible] postcranium."[6]
Shaochilong maortuensisA carcharodontosaurid, formerly Chilantaisaurus maortuensis.
Sinocephale bexelli[7] A Pachycephalosaurid, known from now lost skull fragments. Formerly Troodon bexelli.
Sinornithomimus dongi[8] An ornithomimid. "[Fourteen] skeletons, juvenile to adult."[9]
Indeterminate Iguanodontian

Testudines

Turtles!Taxa!Presence!Description!Images
Kuhnemys maortuensis[10] A Pantrionychid turtle

Ostracods

See also

Notes and References

  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. .
  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.
  3. 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.
  4. 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.
  5. "Table 4.1," in Weishampel, et al. (2004). Page 73.
  6. "Table 17.1," in Weishampel, et al. (2004). Page 364.
  7. 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. e-First. 10. 981–992. 10.1139/cjes-2020-0190. 244227050.
  8. 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.
  9. "Table 5.1," in Weishampel, et al. (2004). Page 138.
  10. S.-Y. Hu. 1964. [Carnosaurian remains from Alashan, Inner Mongolia]. Vertebrata PalAsiatica. 8(1):42-63

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