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Geological Society, London, Special Publications; 2009; v. 315; p. 141-152;
DOI: 10.1144/SP315.11
© 2009 Geological Society of London

Articles

Turtle assemblages of the Khorat Group (Late Jurassic-Early Cretaceous) of NE Thailand and their palaeobiogeographical significance

Haiyan Tong1, Julien Claude2, Varavudh Suteethorn3, Wilailuck Naksri4 & Eric Buffetaut1

1 16 cour du Liégat, 75013 Paris, France
2 ISE-M, UMR 5554 CNRS, Université de Montpellier 2, 34095 Montpellier, France
3 Bureau of Fossil Research and Museum, Department of Mineral Resources, Rama VI Road, Bangkok 10400, Thailand
4 Sirindhorn Museum, Sahatsakhan, Kalasin 46140, Thailand

*Corresponding author (e-mail: eric.buffetaut{at}wanadoo.fr)

The turtle assemblages from the Khorat Group consist mainly of trionychoids. They include the primitive Trionychoidae Basilochelys and basal eucryptodiran turtles from the Phu Kradung Formation (?Late Jurassic); the adocid Isanemys srisuki, the carettochelyid Kizylkumemys sp. and undetermined Trionychoidea from the Sao Khua Formation (Early Cretaceous); and the carettochelyid Kizylkumemys khoratensis and the adocid Shachemys sp. from the Khok Kruat Formation (Aptian). Our study shows some faunal links between the turtle faunas from the Khorat Group and those from the peripheral regions of Asia during the time span of the Khorat Group. Thus the coastal regions of Asia, and more particularly SE Asia, may have been important places for the origin and early diversification of the trionychoids.