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New species of small foraminifers from the Mechetlino Quarry section (Southern Urals, Russia): a potential candidate for the GSSP of the lower boundary of the Global Kungurian Stage

Abstract

Four new species of small foraminifers, Hemigordius infantem sp. nov., Pseudoammodiscus valeryi sp. nov., Nodosaria septumlamellosa sp. nov., and N. zebra sp. nov., are described from strata near the Artinskian/Kungurian boundary in sections of the Southern Urals (Mechetlino Quarry), Middle Urals (Kamayskiy Log), Preuralian Foredeep, and the Sol-Iletsk Swell (boreholes of the Nagumanovskaya Field), Russia. High morphological variability of Hemigordius infantem sp. nov. is noted. It is shown that lateral thickenings and wall structure may not be preserved as a result of subsequent lithification processes. The lumen shape of the last whorl and test morphology are more constant features for all specimens of Hemigordius infantem sp. nov. The high variability of dimensions of H. infantem sp. nov. and Pseudoammodiscus valeryi sp. nov. is clearly seen in the binary discriminative diagrams of the dependence of some features of the tests depending on the number of whorls (test size and proloculus diameter). For the first time, the appearance of species of Nodosaria with a multilayered, poly- or plesiomonolamellar wall have been noted in the upper Artinskian deposits in the Urals. Such a wall is known only in Artinskian and Kungurian deposits in the Urals, and in Artinskian, Kungurian, and Kazanian deposits of the north and northeast of Russia. The appearance of this feature may be a good marker of the upper Artinskian (upper part of the Sarginian), Neostreptognathodus pequopensis Conodont Zone, near Artinskian/Kungurian boundary.

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Acknowledgements

The authors thank all colleagues that were involved and collaborated during fieldwork in the MQ section, and studied of the obtained materials by different methods—M.S. Boiko, V.V. Chernykh, B.I. Chuvashov, G.V. Kotlyar, R.V. Kutygin, G.A. Mizens, G.M. Sungatullina, and R.K. Sungatullin. We are grateful to E.N. Gorozhanina and GazpromDobychaOrenburg Ltd for the core samples. We also thank G.Y. Ponomareva for samples of the Kamayskiy Log section. This study has been carried out following the plans of the scientific research of the Geological Institute of Russian Academy of Sciences (GIN RAN) (project no 0114-2021-0003). We also acknowledge N.A. Klyueva, N.N. Timofeeva, E.P. Krasivicheva and N.N. Sysoev for help with thin sections preparations. We appreciate the valuable comments of G.P. Nestell and M.K. Nestell. We are immensely grateful to the reviewers E.I. Kulagina and the unknown reviewer for their precious comments, suggestions, and corrections.

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Correspondence to Tatiana V. Filimonova or Tatiana N. Isakova.

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Filimonova, T.V., Isakova, T.N. New species of small foraminifers from the Mechetlino Quarry section (Southern Urals, Russia): a potential candidate for the GSSP of the lower boundary of the Global Kungurian Stage. PalZ (2022). https://doi.org/10.1007/s12542-021-00585-4

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Keywords

  • Small foraminifers
  • Permian
  • Artinskian/Kungurian boundary
  • Urals
  • Preuralian foredeep