BIOSTRATIGRAPHIC SIGNIFICANCE OF OSTRACODS FROM THE UPPER DEVONIAN OF THE NORTHWESTERN KUZNETSK BASIN (TOM RIVER, SOUTH EAST OF WEST SIBERIA)

Abstract

New data on ostracods from three Upper Devonian key sections located in the northwestern part of the Kuznetsk Basin along the Tom River have been obtained. Biostratigraphic analysis allowed define biostratons identified in the rank of Beds with ostracods (Bairdia vassinoensis, Hollinella valentinae and Acratia (cooperina) granuliformis). Beds with ostracods are of different correlation potential. Thus, Beds with Bairdia vassinoensis and Beds with Hollinella valentinae can be traced in two structural-facies subzones of the Kuznetsk Basin margin. Forms with a wide geographical distribution have been established in the ostracod complexes. They could be regarded as markers for interregional correlations.