The western part of the Tarim Basin in Xinjiang is one of the main areas in China where the marine Cretaceous is well developed. The Upper Cretaceous Yingjisha Group represented mainly by sediments of littoral, near-shore neritic and estuarine facies is divided in ascending order into the Kukebai Formation, the Oytak Formation, the Ygezya Formation and the Tuylouk Formation. 14 Vol.

The Cretaceous rocks of China are represented by both marine and nonmarine facies. Correlation of the marine sequences is based in particular in ammonites, foraminifera, rudists and palynomorphs, and that of the nonmarine sequences on reptiles (including dinosaur eggs), fish, bivalves, ostracodes, conchostracans, insects, plants, charophytes and palynomorphs.

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