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BIOSTRATIGRAPHIC DATA ON OSTRACODES FROM REFERENCE SECTIONS OF THE MIDDLE AND UPPER DEVONIAN OF THE KUZNETSK BASIN MARGINS (SOUTHEAST-EAST OF WEST SIBERIA)

B. M. Popov

А. А. Trofimuk Institute of Petroleum Geology and Geophysics of SB RAS, Novosibirsk, Russia

The paper presents the results of biostratigraphic studies of ostracodes from reference sections of Middle and Upper Devonian of three structural-facies subdistricts (SFSD) of the Kuznetsk Basin margins. Ostracodes have always been important for biostratigraphic constructions, especially for “closed” oil and gas regions. Considering that the core volumes being lifted from the wells drilled in the Paleozoic in West Siberia are very insignificant, the development of a biostratigraphic basis for the ostracodes associated with the macrofauna finds (brachiopods, ammonoids) is only possible by researching well-exposed, stratigraphically most complete, natural outcrops of its fold margins in the south-east of West Siberia. The sections selected for the study are stratotypical for a number of regional horizons (Vassinsky) and formations (Izylinskaya, Vassinskaya, Shubkinskaya, Yaya-Petropavlovskaya). Despite long-term studies of the Upper Devonian ostracodes of Kuzbass, their biostratigraphic potential has not been fully disclosed before. So, the ostracod complexes were included in the characteristics of local and regional stratigraphic subdivisions; however, no own biostratons were identified for this group. Conducted monographic studies of the ostracodes of Middle and Upper Devonian from the reference sections of the Kuznetsk Basin margins have revealed their most complete taxonomic composition. A stratigraphic analysis of the ostracode distribution has allowed us to identify five biostratones in the rank of layers with fauna. Due to characteristics of the taxonomic composition, the established ostracode layers have different correlation potential.

Keywords: ostracodes, biostratigraphy, Devonian system, Givetian stage, Frasnian stage, Kuznetsk Basin, West Siberia.

DOI 10.20403/2078-0575-2019-2-3-15