The Upper Bajocian-Lower Bathonian boundary section in the outskirts of Saratov: Molluscan characteristics and biostratigraphy |
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| Authors: | V V Mitta V A Zakharov I S Barskov V B Sel’tser and A V Ivanov |
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| Institution: | (1) Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland;(2) Institute of Geological Sciences, Jagiellonian University, Oleandry 2a, 30-063 Krak?w, Poland;(3) School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK |
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| Abstract: | The analysis of all available data on the structure of the Bajocian-Bathonian boundary section in the outskirts of Saratov
(Sokur quarry) and the taxonomic composition of its ammonites, belemnites, and bivalves revealed a continuous succession of
the Pseudocosmoceras michalskii (Upper Bajocian), Oraniceras besnosovi, and Arcticoceras ishmae (Lower Bathonian) zones. In connection with the critique by Meledina et al. (2009), correlation of Bajocian and Bathonian
boundary strata of the Central Russia and Northern Siberia is discussed. The inconsistency of Siberian bivalve and belemnite
assemblages with Central Russian ammonite zones is explained by heterochronous invasions of different molluscan groups. |
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