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Ulansuhai Formation : ウィキペディア英語版
Ulansuhai Formation

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.〔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.〕
The Ulansuhai Formation has traditionally been considered to date to the Aptian-Albian stages of the Late Cretaceous, due to similarities between the Ulansuhai fauna and known Aptian formations.〔 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.〔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.〕〔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. 〕
==Fauna==


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