ИСТИНА

The Mangyshlak Mountains, western Kazakhstan, is one of the key area for inoceramid and foraminiferal records of the Turonian and Coniacian (Upper Cretaceous) of the south-eastern margin of the Russian Platform. The Turonian-Coniacian succession in Mangyshlak is distinctly two-fold inits facies development. The lower, sandy siliciclastic unit of the Early and earliest Middle Turonian;and the upper, carbonate unit, of the Late Turonian-Coniacian. The units contact along a distinctunconformity, developed usually as a composite hardground with phosphatic horizon and associated stratigraphic gaps (short sea level chamges).