CHANGES IN THE TAXONOMICAL COMPOSITION AND STRUCTURE OF THE FORAMINIFERAI ASSOCIATIONS IN THE COLLOVIAN TO LATE JURASSIC OF THE SW WEST SIBERIAN BASIN
Summarizes results of the detailed study of foraminifers from Middle-Upper Jurassic Shaim petroleum district (West Siberia) are presented. The Callovian to the Volgian age of deposits was confirmed by different foraminiferal assemblages. Peculiarities of change in foraminifers associations taxonomic composition and structure in time and space were investigated.