Original paper

Middle Oxfordian - Lower Kimmeridgian ostracod zones from the Mikhalenino section (Kostroma region) and their comparison with synchronous strata of the Eastern and Western Europe

Tesakova, Ekaterina M.; Demidov, Stephan M.; Guzhov, Alexander V.; Rogov, Mikhail A.; Kiselev, Dmitry N.

Abstract

The study focuses on Oxfordian-Kimmeridgian ostracods from the Mikhalenino section (Kostroma region, Russia). In the Upper Oxfordian - Lower Kimmeridgian (Densiplicatum - Bauhini ammonite Zones) we distinguished ostracod zones: Sabacythere attalicata - Eucytherura costaeir- regularis (Densiplicatum Zone), Eucyterura - Tethysia (Tenuiserratum to Bauhini Zone). In the lower Kimmeridgian, Kitchini ammonite Zone (Subkitchini Subzone), we identified ostracod zones Schuleridea triebeli, Neurocythere jakovlevae - Klentnicella rodewaldensis and Galliaecytheridea fragilis. A comparison has been made between the ostracod zones from the Mikhalenino section and coeval strata from Western and Eastern Europe. In addition, a new species, Neurocythere jakovlevae Kolpenskaya in Tesakova et al., sp. nov., was described from the Lower Kimmeridgian, Kitchini Zone, Subkitchini Subzone.

Keywords

stratigraphyoxfordiankimmeridgianostracodskostroma region (russia)