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Micropaleontology; September 2007; v. 53; no. 5; p. 345-370; DOI: 10.2113/gsmicropal.53.5.345
© 2007 Micropaleontology Project
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Article

Cretaceous (Albian to Coniacian) Ostracodes from the subsurface of the Jaisalmer Basin, Rajasthan, India

Bernard Andreu1, Jean-Paul Colin2 and Jagmohan Singh3

1 LMTG, Université de Toulouse III, CNRS, IRD, OMP, 14 Av. E. Belin, F-31400 Toulouse, France
2 3 Impasse des Biroulayres, 33610 Cestas, France
3 Oil and Natural Gas Corporation, Western Onland Basin, Baroda, India email: andreu{at}lmtg.obs-mip.fr; jean-paul.colin{at}worldonline.fr; jagmohansinghongc{at}gmail.com

In the Albian to Coniacian subsurface series of Jaisalmer Basin, Rajasthan, India, the distribution of ostracode assemblages is proposed, calibrated using planktonic foraminifera biozones of the global standard stages. Ninety species, 19 named and 71 in open nomenclature, belonging to 45 known genera and one unknown, are indexed; their first and last appearance (or first and last observation) levels, compared with the stage boundaries, are used as biostratigraphical guide markers. The ostracode assemblages enable us to recognize and define the Cenomanian, Turonian and Coniacian stages. Cenomanian-Turonian faunistic communications appear between the Jaisalmer Basin and different countries of the southern Tethyan margins and the eastern and western Atlantic borderlands.






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