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

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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: KIMMERIDGIAN; KOSTROMA REGION (RUSSIA); OSTRACODS; OXFORDIAN; STRATIGRAPHY

Document Type: Research Article

DOI: https://doi.org/10.1127/0077-7749/2012/0281

Publication date: 2012-12-01

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