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Microfauna, Palynomorphs, and Biostratigraphy of the Upper Bajocian Garantiana garantiana Zone (Middle Jurassic) of the Bolshoi Zelenchuk River Basin, North Caucasus

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Abstract—

Microfossils of the upper Bajocian Garantiana garantiana Zone of the Kyafar River (a tributary of the Bolshoi Zelenchuk River, Karachay-Cherkess Republic) are studied. The zone is represented by dark gray claystone-like clay series with sporadically scattered nodules, often forming interlayers, and is recognized in the upper subformation of the Djangura Formation. The taxonomic composition and distribution in the section of foraminifers, ostracods, dinoflagellate cysts, and miospores are studied. The range of foraminiferal and dinocyst biostratigraphic units and their correlation with the ammonite scale are established. On the basis of benthic foraminifera, these are Beds with Ophthalmidium caucasicum, corresponding to most of the Garantiana Zone, and Beds with Sublamarckella terquemi, corresponding to the upper part of the Garantiana Zone and the lower part of the Parkinsoni Zone. The Beds with Globuligerina dagestanica, recognized on the basis of planktonic foraminifera, are compared with the entire studied interval from the Garantiana Zone to the bottom of the lower Bathonian inclusive. The Beds with Meiourogonyaulax valensii and Rhynchodiniopsis? regalis (dinocysts) are considered equivalent to the entire range of the Garantiana Zone to the lower part of the Parkinsoni Zone inclusive. The key fossils are illustrated.

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ACKNOWLEDGMENTS

M.P. Sherstyukov (Stavropol), O. Nagel (Radeberg, Germany), S. Gräbenstein (Bodelshausen, Germany), and V. Pirkl (Gerlingen, Germany) provided friendly assistance with field work. N.V. Novozhilova (Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk) assisted in the imaging of foraminifera. E.M. Tesakova (Moscow State University, Moscow) and M. Franz (Freiburg, Germany) consulted on the identification of ostracods. Photographs of ostracods were provided by L.A. Kartseva (Botanical Institute, Russian Academy of Sciences, St. Petersburg). Comments from the reviewers G.N. Alexandrova and V.A. Zakharov (Geological Institute, Russian Academy of Sciences, Moscow), as well as D.B. Gulyaev (Yaroslavl), undoubtedly improved the manuscript.

Funding

This research was partially supported (L.A. Glinskikh, V.V. Mitta) by the Russian Foundation of Basic Research (project no. 19-05-00130) and is also a contribution to the Fundamental Scientific Research Program no. 0331-2019-0005 (L.A. Glinskikh). The authors are grateful to all individuals and organizations that contributed to the preparation and publication of this work.

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Authors and Affiliations

  1. Borissiak Paleontological Institute, Russian Academy of Sciences, 117647, Moscow, Russia

    V. V. Mitta

  2. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    L. A. Glinskikh

  3. Geologorazvedka, 192019, St. Petersburg, Russia

    Yu. N. Savelieva & O. V. Shurekova

  4. Cherepovets State University, 162600, Cherepovets, Russia

    V. V. Mitta

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  1. V. V. Mitta
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Translated by S. Nikolaeva

Reviewers G.N. Aleksandrova, D.B. Gulyaev, and V.A. Zakharov

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Mitta, V.V., Glinskikh, L.A., Savelieva, Y.N. et al. Microfauna, Palynomorphs, and Biostratigraphy of the Upper Bajocian Garantiana garantiana Zone (Middle Jurassic) of the Bolshoi Zelenchuk River Basin, North Caucasus. Stratigr. Geol. Correl. 29, 36–54 (2021). https://doi.org/10.1134/S0869593821010068

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