Brachiopods from the Lower Permian of the Khospokhchon Section in the Southern Verkhoyanie (Northeast Russia)

A biostratigraphic division of the Lower Permian into brachiopod zones of Jakutoproductus verkhoyanicus, Jakutoproductus insignis, Jakutoproductus terechovi, and Jakutoproductus rugosus is observed within the Northern and  Western Verkhoyanie. According to the literature, only the complex of the lower biostratigraphic unit (Verkhoyanicus Zone) was previously confidently established in the Southern Verkhoyanie. Meanwhile, representatives of the two middle zones were not observed, and the presence of the index species of the Rugosus zone was only indicated in the southern part of the region (Yudoma River Basin). A monographic study of the brachiopod collection from the Upper Olchan Subformation of the stratotype of the Olchan Formation (Khospohchon section) allowed us to rethink the biostratigraphic division of the Asselian-Sakmarian deposits in the Southern Verkhoyanie. The brachiopods of the Upper Olchan Subformation of the Khospohchon Creek (Menkule River Basin) belong to three successive biostratigraphic zones: Verkhoyanicus, Insignis, and Terechovi. Information on the presence of representatives of the species Jakutoproductus rugosus Ganelin in the Southern Verkhoyanie leads to the assumption that all four biostratigraphic zones of the Asselian-Sakmarian deposits of Verkhoyanie are present in this region. Three upper zones (Insignis, Terechovi, and Rugosus) demonstrated a direct correlation with the Ogonerian Regional Stage of the Omolon massif by their common zonal species. The new results indicate the need for a comprehensive study of the key sections of the Olchan Formation to substantiate the Carboniferous-Permian and Asselian-Sakmarian boundaries in Verkhoyanie using both biostratigraphic and chemostratigraphic methods.

1. Abramov B.S. Biostratigraphy of the Sette-Daban Carboniferous deposits (Southern Verkhoyanie). Moscow: Nauka; 1970. 178 p. (In Russ.)

2. Abramov B.S., Grigorjeva A.D. Biostratigraphy and brachiopods of the Middle and Upper Carboniferous in Verkhoyanie. Moscow: Nauka; 1983. 168 p. (In Russ.)

3. Abramov B.S., Grigorjeva A.D. Biostratigraphy and brachiopods of the Permian in Verkhoyanie. Moscow: Nauka; 1988. 204 p. (In Russ.)

4. Gurjev G.A., Ganelin V.G. Southern Verkhoyanie. Diagnosis and mapping of squamous-thrust structures. Saint Petersburg: VSEGEI; 1994; 188 p. (In Russ.)

5. Zimkin A.V. On the stratigraphy of the Permian deposits of Northeast USSR. Materials on geology and minerals of the North-East of the USSR. 1957; Magadan: Magadanskoe Knizhnoe izd-vo. Issue 11:31–64. (In Russ.)

6. Resolutions of the Third Interdepartmental Regional Conference on the Stratigraphy of the Precambrian, Paleozoic, and Mesozoic of Northeastern Russia. T.N.Koren’ and G.V.Kotlyar. Eds. St. Petersburg: Vseross. NauchnoIssled. Geol. Inst.; 2009. 268 p. (In Russ.)

7. Makoshin V.I., Kutygin R.V. Correlation of the Asselian-Sakmarian deposits of the Northern and Western Verkhoyansk regions by brachiopods. Arctic and Subarctic Natural Resources. 2019;24(3):5–22. https://doi.org/10.31242/2618-9712-2019-24-3-1 (In Russ.)

8. Makoshin V.I., Kutygin R.V. Asselian–Sakmarian (Lower Permian) brachiopod zonation of the Verkhoyansk Region, Northeast Russia. Stratigraphy and Geological Correlation. 2020;28(7):716–744. https://doi.org/10.1134/S0869593820040061

9. Makoshin V.I., Kutygin R.V. Biostratigraphy of the terminal Carboniferous of the lower reaches of the Lena River (Kubalakh section, Russia). Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki. 2021;163(3):406–413. https://doi.org/10.26907/2542-064X.2021.3.406-413 (In Russ.)

10. Makoshin V.I., Kutygin R.V. Asselian–Sakmarian brachiopod zonation of the left bank of the lower reaches of the Lena River, Northeast Russia. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki. 2022; 164(4):577–589. https://doi.org/10.26907/2542-064X.2022.4.577-589

11. Klets A.G. Brachiopod zones, their significance in the division and correlation of the Upper Paleozoic deposits of Southern Verkhoyanie. Limits of accuracy of biostratigraphic correlation. Moscow: Paleontological Institute RAS; 1995:37–47. (In Russ.)

12. Klets A.G. Upper Paleozoic of Marginal seas of Angarida. Novosibirsk: Academic Publishing House “Geo”; 2005. (In Russ.)

13. Kutygin R.V., Budnikov I.V., Sivtchikov V.E. The main features of the Kasimovian-Gzhelian and Permian stratigraphy in the Siberian platform and adjacent fold belts. Arctic and Subarctic Natural Resources. 2020; 25(4):5–29. https://doi.org/10.31242/2618-9712-2020-25-4-1 (In Russ.)

14. Alekseev A.S., Nikolaeva S.V., Goreva N.V., Donova N.B., Kossovaya O.L., Kulagina E.I., Kucheva N.A., Kurilenko A.V., Kutygin R.V., Popeko L.I., Stepanova T.I. Russian Regional Carboniferous Stratigraphy. Lucas S.G., Schneider J. W., Wang X. and Nikolaeva S. (eds). The Carboniferous Timescale. Geological Society, London, Special Publications. 2022:49–117. https://doi.org/10.1144/SP512-2021-134

15. Budnikov I.V., Kutygin R.V., Shi G.R., Sivtchikov V.E., Krivenko O.V. Permian stratigraphy and paleogeography of Central Siberia (Angaraland) – A review. Journal of Asian Earth Sciences. 2020; vol. 196; article 104365. https://doi.org/10.1016/j.jseaes.2020.104365

16. Ganelin V.G., Biakov A.S. The Permian biostratigraphy of the Kolyma–Omolon region, Northeast Asia. Journal of Asian Earth Sciences. 2006;26(3-4):225–234.

17. Makoshin V.I., Kutygin R.V. About the selection of Jakutoproductus insignis Beds in the Lower Permian deposits of Western Verkhoyanie. Vestnik of the M.K. Ammosov North-Eastern Federal University. 2013;10(4):31– 34. (In Russ.)

18. Ganelin V.G., Biakov A.S., Karavaeva N.I. Some questions of the theory of stratigraphy and the stratigraphic scale of Permian in Northeast Asia. Toward detailed stratigraphic schemes and paleogeographic reconstructions. Moscow: GEOS; 2001:194–209. (In Russ.)

19. Kutygin R.V., Biakov A.S., Makoshin V.I., Budnikov I.V., Peregoedov L.G., Krivenko O.V. Biostratigraphy and important biotic events in the Western Verkhoyansk Region around the Sakmarian–Artinskian boundary. Palaeoworld. 2020;29(2):303–324. https://doi.org/10.1016/j.palwor.2018.10.001

20. V.G. Taimyr-Kolyma subregion. Main features of the stratigraphy of the Permian system in the USSR. Leningrad: Nedra; 1984:111–123. (In Russ.)