Abstract—
Permian marine bivalves of the Pronchishchev Ridge (North Siberia) were systematically studied for the first time.. The presence of the Middle and Upper Permian with five biostratigraphic levels was established based on fossil findings. In the Middle Permian, these are the bivalve Kolymia inoceramiformis–K. plicata (undivided) and Kolymia multiformis zones, and in the Upper Permian—the Maitaia bella Zone (Beds with Phestia ex gr. ovata), Maitaia belliformis Zone, and Intomodesma costatum Zone. The bivalve assemblages from the Middle and the lower Upper Permian (up to the Intomodesma costatum Zone) are similar in their taxonomic composition to those from the Western and Northern Verkhoyansk regions. The uppermost Permian fossil assemblages (Intomodesma costatum Zone) are different. They are represented almost exclusively by monotaxonic aggregations of the large pectinoid Streblopteria rotunda (Lutkevich et Lobanova) and rather rare representatives of the genus Intomodesma. The marine basin of the present-day Pronchishchev Ridge had stable links with the Verkhoyansk basin throughout almost the entire Permian. This basin was very shallow and may have experienced episodes of desalination. In the end of the Permian, the paleogeographic situation changed, and the connection between the Pronchishchev Ridge and the East Taimyr basins became more pronounced. Most characteristic bivalve species are illustrated, and a new species Kolymia rutskovi Biakov, sp. nov. is described.
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Notes
The authors of the present paper use the subdivision of the Permian System accepted in Russia. Thus, we consider the Severodvinian Stage of the Permian of the General (Russian) stratigraphic scale, preliminary corresponding to the Capitanian Stage and most of the Wuchiapingian Stage of the International Stratigraphic Scale (ISS), as part of the Upper Permian. The Capitanian Stage in the ISS is the upper stage of the Middle Permian.
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ACKNOWLEDGMENTS
We are grateful to A.V. Yadrenkin, A.Yu. Popov, and L.B. Khazin (IPGG SB RAS) for assistance in collecting fossil fauna, T.V. Filimonova (GIN RAS) for consultations on Permian foraminifers, I.L. Vedernikov (NEISRI FEB RAS) for preparing images of bivalves, S.V. Popov and A.V. Guzhov (PIN RAS) for remarks and suggestions, which allowed us to make the article more complete and better organized.
Funding
This work was supported by the Russian Foundation for Basic Research (project nos. 18-05-00191, 19-05-00926, and 20-05-00604) and by the subsidy allocated to Kazan Federal University for the state assignment #671-2020-0049 in the sphere of scientific activities (no. 671-2020-0049). This work was and performed within the framework of State Assignments of NEISRI FEB RAS, GIN RAS, and IPGG SB RAS (project FSR no. 0331-2019-0004). Some research works (paleogeographic conclusions) were supported by the Russian Science Foundation, project no. 19-17-00178.
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Biakov, A.S., Danukalova, M.K., Kuzmichev, A.B. et al. Permian Bivalves of the Pronchishchev Ridge (North Siberia): New Data on Taxonomic Composition, Biostratigraphy, and Biogeographic Relationships. Paleontol. J. 55, 259–271 (2021). https://doi.org/10.1134/S0031030121030084
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DOI: https://doi.org/10.1134/S0031030121030084