Turonian and Coniacian on the Territory of the Eastern Perithetys. Biostratigraphy and Paleogeography

The results of a comprehensive study of Turonian and Coniacian deposits on the territory of the Eastern Perithetys are presented. Issues of changing paleoenvironments and foraminifera assemblages at the boundaries of the stages are considered. It is shown that the oceanic anoxic event OAE 2 at the boundary the Cenomanian and Turonian was rather long-term and had several phases. The Turonian–Coniacian interval was characterized by the existence of a relatively deep-water open-sea epicontinental of the margins basin of the Tethys Ocean, where carbonate sedimentation (mainly the hemipelagic type) took place.