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The Oligocene Reference Section in the South of the East European Platform (Northern Ergeni)

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Abstract

This work presents the results of the integrated study of the sequence of Oligocene (Maikop) and underlying Eocene deposits uncovered in borehole 768 (362 m). This section can be regarded as the reference one as for Northern Ergeni, as for the entire northern part of the Eastern Paratethys. The data obtained on lithology, mollusks, and benthic foraminifers enabled us to subdivide the Oligocene interval of the Maikop Group into formations and subformations (Tsimlyanian, Solenovian, and Kalmyk), to correlate it with adjacent and remote areas of the Paratethys and with the scale of regional stages, and to reconstruct the main sedimentation conditions. On the basis of nannoplankton and dinocysts, these subdivisions are correlated with the zonal stratigraphic scale (Gradstein et al., 2012), and according to the palynological data, the evolution of climatic conditions at the Paratethys northern margin is reconstructed. The phytoplankton, foraminiferal, and paleomagnetic data show a significant reduction of the section in its Eocene interval. The latter includes only negatively magnetized intervals of the Keresta, Kuma, and Belaya Glina formations, separated by discontinuities, as well as the complete set of biotic and paleomagnetic zones of the Lower Oligocene. The lower subformation of the Solenovian Formation (50 m), eroded in most of the sections of Ciscaucasia, is characterized by unusual completeness. It is probable that the Kalmyk Formation in this section is incomplete and is represented only by the first half of the Chattian.

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Notes

  1. Hereinafter, in the description of the section in similar context, the first bracketed number means the thickness of a bed, and the second one means the depth of the bottom of a layer.

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ACKNOWLEDGMENTS

We are sincerely grateful to reviewer E.M. Bugrova for numerous valuable remarks which contributed to improving the manuscript.

Funding

The field and laboratory analytical works were carried out by the Volgograd geological prospecting expedition with participation of authors of this article during the geological surveys within the sheet М-38-ХХXIII (Krasnoarmeisk).

This work was supported by the Russian Foundation for Basic Research (project no. 17-05-00047). Palynological and macrofloristic (spores, pollen, organic-walled phytoplankton) studies were performed in accordance with research plans at the Geological Institute of the Russian Academy of Sciences within the framework of the research project no. 0135-2019-0044 (M.A. Akhmetiev and N.I. Zaporozhets). Analytical studies were supported by the Program of the Presidium of the Russian Academy of Sciences (project no. 0135-2018-0050).

Reviewers E.M. Bugrova, Yu.B. Gladenkov, and E.P. Radionova

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Correspondence to A. S. Zastrozhnov.

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Translated by D. Voroshchuk

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Zastrozhnov, A.S., Popov, S.V., Beniamovsky, V.N. et al. The Oligocene Reference Section in the South of the East European Platform (Northern Ergeni). Stratigr. Geol. Correl. 27, 442–474 (2019). https://doi.org/10.1134/S0869593819040063

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