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On the Stratigraphy of the Bajocian–Bathonian Boundary Beds (Middle Jurassic) of the Izhma River Basin, Northern European Russia

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Abstract—

Data on fossils and stratigraphy of the Bajocian and Bathonian boundary deposits in the north of European Russia recently published by Ippolitov, Zakharov, Kiselev, et al. are discussed. Their previously proposed correlation of the Middle Jurassic reference sections of the Pechora North region on the Dreshchanka River (a tributary of the Izhma River), as a result of which the visible thickness of deposits is doubled, is critically revised. New finds of the ammonite Arctocephalites arcticus (Newton) confirm the biostratigraphic data previously obtained by Mitta et al. The interval with Mezounio zwerkovi and Retroceramus lungershauseni, previously recognized by Zakharov et al., occurs at the visible base of the Sysola Formation immediately below the interval of finds of Arctocephalites arcticus and most likely should be correlated with the uppermost Bajocian, rather than with the lower Bajocian. Meledina’s proposal to transfer the Borealis, Indistinctus, and Pompeckji zones of the Вoreal scale from the upper Bajocian to the lower Bajocian is considered to be unsubstantiated.

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Notes

  1. Here, an inaccuracy is observed in the cited papers by my colleagues. This section is located on the left bank of the Dreshchanka River, rather than on its right bank (Zakharov et al. 2020, p. 75). Admittedly, in our work (Mitta et al., 2015), the location of the D-3 [26] section was also incorrectly shown because of a technical error.

  2. All material on bivalves and brachiopods found on the Dreshchanka River was passed to V.A. Zakharov, who used his identifications in comparing the early Bathonian assemblages of the Timan-Pechora and East European paleobiogeographic provinces (Mitta et al., 2011).

  3. Kiselev (2020, p. 96) regrets that, for some of the finds, Mitta “did not give an indication of their position relative to the top or bottom of the bed.” Unfortunately, in Kiselev’s paper under discussion, all ammonites are cited without specifying their stratigraphic provenance.

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ACKNOWLEDGMENTS

Sedimentologist V.V. Kostyleva (Geological Institute, Russian Academy of Sciences), microfauna specialist L.A. Glinskikh (Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences), and geologist and surveyor A.V. Stupachenko (Moscow) took an active part in the study of the Middle Jurassic sections of the Izhma River basin. Amateur paleontologists from Germany O. Nagel (Radeberg) and S. Gräbenstein (Bodelshausen) provided friendly assistance during field work. Specialists in different groups of fossils, V.A. Zakharov (Geological Institute, Russian Academy of Sciences), O.S. Dzyuba, B.L. Nikitenko, and B.N. Shurygin (Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences), took part in the processing of the material collected. The Paleontological Institute, Russian Academy of Sciences, assisted with organization of the Jurassic fieldwork team. I am grateful to all individuals and organizations that contributed to the study of the Jurassic of the Pechora region. I would also like to express my sincere gratitude to the reviewers D.B. Gulyaev (Yaroslavl) and M.A. Rogov (Geological Institute, Russian Academy of Sciences), whose critical remarks made it possible to improve the manuscript.

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Correspondence to V. V. Mitta.

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Reviewers D.B. Gulyaev, V.A. Zakharov, and M.A. Rogov

Translated by S. Nikolaeva

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Mitta, V.V. On the Stratigraphy of the Bajocian–Bathonian Boundary Beds (Middle Jurassic) of the Izhma River Basin, Northern European Russia. Stratigr. Geol. Correl. 29, 598–605 (2021). https://doi.org/10.1134/S0869593821050063

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