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Upper Cretaceous Deposits in the Volsk Structural Zone of the East European Platform: Turonian–Lower Campanian of the Kommunar Section: Paper 1. Geological Setting, Benthic Foraminifers, and Magnetostratigraphy

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Abstract

The results of microfaunistic (benthic foraminifers) and magnetostratigraphic (paleomagnetic and petromagnetic) studies obtained in the lower part of the Upper Cretaceous deposits of the Kommunar section are presented. On the basis of the study of benthic foraminifers, the section consists of middle and upper Turonian, Coniacian, lower and upper Santonian, and basal horizon of the lower Campanian. In addition, all Coniacian zones and subzones of the East European Platform have been established. These data confirm the importance of the Kommunar section as a stratotype of the Volsk Formation (Coniacian of the Middle and Lower Volga region). In the Kommunar section, the Turonian and Coniacian are characterized by a normal polarity, and the Santonian and lower Campanian are characterized by a reversed polarity.

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ACKNOWLEDGMENTS

We are grateful to A.G. Manikin, V.A. Grishchenko, and V.A. Fomin (Saratov State University) for participation in the field study of the section, V.A. Musatov (Lower Volga Scientific Research Institute of Geology and Geophysics) for providing the acid treatment conditions for microfaunistic samples, A.M. Zakharevich (Saratov State University) for help in obtaining the images of foraminifer shells using an electron microscope, A.Yu. Guzhikov for advice on the interpretation of the results obtained, and E.Yu. Baraboshkina for valuable recommendations and comments that contributed to detailing of the data reported.

Funding

The field works and magnetostratigraphic studies were supported by the Russian Science Foundation (project no. 20-77-00028) “Testing the Hypothesis of the Reversed Polarity Epochs in Turonian, Coniacian, and Santonian (Late Cretaceous).” The study of benthic foraminifers was supported by the Russian Foundation for Basic Research (project no. 20-35-90077/20) “Benthic Foraminifers as a Key Factor in the Detailed Subdivision and Stratigraphic Correlation of the Turonian–Coniacian Deposits in the Volga Region.”

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Authors and Affiliations

  1. Saratov State University, 410012, Saratov, Russia

    E. M. Pervushov, I. P. Ryabov, V. B. Seltser, E. A. Kalyakin, A. A. Guzhikova, E. I. Ilyinsky & D. V. Khudyakov

  2. University of Warsaw, Warsaw, Poland

    I. Walaszczyk

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  1. E. M. Pervushov
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  2. I. P. Ryabov
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  3. V. B. Seltser
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  6. A. A. Guzhikova
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  7. E. I. Ilyinsky
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  8. D. V. Khudyakov
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Correspondence to E. M. Pervushov.

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Translated by E. Maslennikova

Reviewers A.S. Alekseev and E.Yu. Baraboshkin

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Pervushov, E.M., Ryabov, I.P., Seltser, V.B. et al. Upper Cretaceous Deposits in the Volsk Structural Zone of the East European Platform: Turonian–Lower Campanian of the Kommunar Section: Paper 1. Geological Setting, Benthic Foraminifers, and Magnetostratigraphy. Stratigr. Geol. Correl. 29 (Suppl 1), S96–S119 (2021). https://doi.org/10.1134/S0869593822020046

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