Ammonites and inoceramids of the Middle–Upper Albian of Mangyshlak (western Kazakhstan); systematics, biostratigraphy and biogeography

Abstract

Ammonites and inoceramid bivalves are described from an interval spanning the upper Lower to upper Upper Albian at five localities in the Mangyshlak Anticlinorium in central-western Kazakhstan. The stratigraphic record is discontinuous. Ammonites include both endemic and more cosmopolitan taxa, with representatives of the genera Beudanticeras, Cleoniceras, Hoplites, Anahoplites, Semenoviceras, Euhoplites, Dimorphoplites, Epihoplites, Callihoplites, Sulcohoplites, Arrhaphoceras, Placenticeras, Hysteroceras, Pervinquieria, Goodhallites, Idiohamites, and Hamites. The inoceramid bivalves present include representatives of the genera Actinoceramus and Gneisoceramus.