NEW DATA ON BIOSTRATIGRAPHY AND FORAMINIFERA OF THE TURONIAN STAGE OF WEST SIBERIA

The northern paleobiogeographic region of West Siberia is characterized by studied new sections of the Turonian – the Upper stage of the Middle series of the Cretaceous System. Two widespread foraminifera complexes have been determined in the section of the Kuznetsovsky Horizon, attributed to the Turonian: the lower one with Gaudryinopsis angustus and the upper one with Pseudoclavulina hastata. New data on the upper half of the Kuznetsovsky Horizon with the second of these foraminifera complexes offered an opportunity to clarify the position of the boundary layers of the Middle Cretaceous with the Upper (Coniac-Maastricht) series of the Cretaceous System.