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

Abstract

Tesakova, e.M., DeMiDov, s.M., Guzhov, a.v., RoGov, M.a., kiselev, D.N. (2012): Middle Oxfordian - Lower Kimmeridgian ostracod zones from the Mikhalenino section (Kostroma region) and their comparison with synchronous strata of the Eastern and Western Europe. - N. Jb. Geol. Palaont. Abh., 266: 000-000; Stuttgart. Abstract: The study focuses on Oxfordian-Kimmeridgian ostracods from the Mikhalenino sec- tion (Kostroma region, Russia). In the Upper Oxfordian - Lower Kimmeridgian (Densiplicatum - Bauhini ammonite Zones) we distinguished ostracod zones: Sabacythere attalicata - Eucytherura costaeirregularis (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 Galliaecyth- eridea fragilis. A comparison has been made between the beds with the ostracod fauna 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.