An integrated inoceramid-foraminiferal biostratigraphy of the Turonian and Coniacian strata in south-western Crimea, Soviet Union

Abstract

The inoceramid and the foraminiferal zonation within the Turonian and Lower Coniacian sequence of south-western Crimea (Soviet Union), based on the material from the Aksu-Dere sections are analyzed. The traditional Inoceramus labiatus Zone is subdivided into the Mytiloides mytiloides Zone and the Mytiloides hercynicus Zone. Within the Inoceramus woodsi (=costellatus) Zone of the Upper Turonian commonly used in the Soviet Union, the I. costellatus, the Cremnoceramus? waItersdorfensis, and the C. rotundatus Zone are recognized, and the Turonian/Coniacian boundary is placed at the base of the latter. Taxonomy of the selected inoceramid species is shortly discussed