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Reference Section of the Campanian Stage of the Southwestern Crimea: Problems of Substage Subdivision and Global Correlation

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Abstract

Stratigraphy of Campanian deposits in the stratotype of the Kudrinskaya Formation in the Southwestern Crimea is revised. For the first time, integrated sedimentological, biostratigraphic (ichnofossils, cephalopods, inoceramids, foraminifers, dinocysts, nannoplankton, gilianelles), isotope-geochemical, paleo- and petromagnetic characteristics of the section were obtained. The boundary of the lower and upper Campanian is substantiated and confirmed by U–Pb dating of zircons from the well-known bentonite (kil) clay bed in the interval of 77–80 Ma. It is proposed to accept the Campanian Substage boundary of the General Stratigraphic Chart (for bipartite stage subdivision) at the top of the Chron C33r, located near the δ13C isotopic excursion “MCaE” – Mid-Campanian Event, near the first occurrence of the benthic foraminifer Brotzenella monterelensis and a number of other traditional biomarkers.

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ACKNOWLEDGMENTS

The authors are grateful to A.G. Manikin and E.V. Naumov (Saratov State University) for participation in field work, V.A. Grishchenko (Saratov State University) for assistance in sampling and laboratory research, I. Walaszczyk (University of Warsaw, Republic of Poland) for identifying inoceramids, N. Keutgen (University of Natural Resources and Life Sciences, Austria) for discussing belemnites finds, B.G. Pokrovsky (Geological Institute, Russian Academy of Sciences) for consultations on the geochemistry of isotopes, A.M. Zakharevich (Saratov State University) for photographing BF tests on a scanning microscope. We thank the reviewers for their extensive work with the manuscript, which contributed to a significant improvement of the paper.

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The study was supported by the Russian Science Foundation, grant no. 22-17-00091, https://rscf.ru/project/22-17-00091/.

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Baraboshkin, E.Y., Guzhikov, A.Y., Aleksandrova, G.N. et al. Reference Section of the Campanian Stage of the Southwestern Crimea: Problems of Substage Subdivision and Global Correlation. Stratigr. Geol. Correl. 32, 89–143 (2024). https://doi.org/10.1134/S0869593824020023

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  • DOI: https://doi.org/10.1134/S0869593824020023

Keywords:

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