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On the stratigraphic relationship of the Late Paleozoic species Somoholites andrianovi Kutygin, 1999 (Ammonoidea, Goniatitida)

R.V. Kutygin
DOI 10.31242/2618-9712-2022-27-1-46-55

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Diamond and Precious Metal Geology Institute SB RAS, Yakutsk, Russia
[email protected]

Received 20.01.2022
Accepted 25.02.2022

Citation
Kutygin R.V. On the stratigraphic relationship of the Late Paleozoic species Somoholites andrianovi Kutygin, 1999 (Ammonoidea, Goniatitida) // Arctic and Subarctic Natural Resources. 2022, Vol. 27, No. 1. P. 46–55. (In Russ.) https://doi.org/10.31242/2618-9712-2022-27-1-46-55

Abstract. The genus Somoholites is important for the Boreal Carboniferous-Permian correlation, but only two reliable finds of ammonoids of this genus are known in the Upper Paleozoic of Northeastern Russia. The holotypes of Somoholites andrianovi Kutygin and S. sebyanicus Kutygin found in Verkhoyanie have a significant morphological distance and probably belong to different phylogenetic branches of Somoholites. There is no doubt that S. sebyanicus belongs to the lower part of the Permian (Khorokytian Regional Stage). But the stratigraphic relationship of the holotype of S. andrianovi had ambiguous interpretations of literary sources for a long time. L.A. Musalitin discovered goniatite in scree on the Syrgan-Syukyut river in the upper reaches of the Sobolokh-Mayan river (Orulgan ridge). As a result of studying his field materials, the holotype of S. andrianovi was determined not to belong to the Lower Permian, as previously thought, but to the Gzhelian Stage of the Upper Carboniferous (Khaldan Formation). This is the first find of ammonoids recorded in Verkhoyanie, belonging to the terminal part of the Carboniferous system. Clarification of the stratigraphic relationship of the considered Somoholites allows us to rethink the ideas about the distribution of the Verkhoyanian ammonoid community during the Late Kygyltasian biotic crisis. In addition to the stratigraphic relationship of S. andrianovi, its suture was refined, representing the adult stage of ontogeny. Possible scenarios for the biogeographic distribution of ammonoids in the terminal Carboniferous of the East Boreal subregion and the origin of the Gzhelian Somogolites of Verkhoyanie are considered.

Keywords: goniatite, Khaldan Formation, Gzhelian Stage, Orulgan Ridge, Verkhoyanie.

Acknowledgements. The research was carried out according to the State Assignment of the DPMGI SB RAS.


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