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FORAMINIFER ZONES OF THE GANKINSKY HORIZON (UPPER CAMPANIAN – MAASTRICHTIAN) OF THE WEST SIBERIA, THEIR IMPORTANCE FOR STRATIGRAPHY

V. M. Podobina, T. G. Kseneva.

National Research Tomsk State University, Tomsk, Russia

In the Gankinsky Horizon of the West Siberian province, layers with foraminifer complexes have been established and divided into three zones: 1) Cibicidoides primus (Upper Campanian); 2) Spiroplectammina variabilis, Gaudryina rugosa spinulosa (Lower Maastrichtian); 3) Spiroplectammina kasanzevi, Bulimina rosenkrantzi (Upper Maastrichtian). The species composition of foraminifera in the zone stratotypes and other sections of the central paleobiogeographic region has been determined and compared with that of the marginal regions.

Keywords: foraminifera, zones, Gankinsky Horizon, Upper Campanian, Maastrichtian, West Siberia.

DOI 10.20403/2078-0575-2019-3-3-24