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Ammonoids of the Genus Yakutosirenites from the Carnian Stage of Northeast Asia

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Ammonoids of the genus Yakutosirenites (Sirenitidae) from the Carnian deposits of Northeast Asia have been revised. On the basis of the study of morphogenesis of the most important shell structures, the genus Yakutosirenites is subdivided into two subgenera: Yakutosirenites with the type species Sirenites pentastichus Vozin, 1964 and Vozinites with the type species Sirenites armiger Vozin, 1965. A description of the genus and its subgenera and species is given. The significance of the species of these subgenera for biostratigraphic subdivision and correlation of the lower/upper Carnian boundary interval is substantiated. The Boreal–Tethyan correlation of the Yakutosirenites pentastichus Zone has been clarified. For the first time, taking into account the Yakutosirenites revision data, the upper part of this zone is compared only to the Arctosirenites canadensis beds of Arctic Canada and to the lower subzone of the Tropites welleri Zone of British Columbia, which are equivalent to the lower part of the Tropites subbullatus Zone of the Alpine standard.

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We thank E.S. Sobolev (Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk), А.Yu. Egorov (Aerogeology State Research and Production Enterprise, Moscow), N.Yu. Bragin (Geological Institute, Russian Academy of Sciences, Moscow), and А.B. Kuzmichev (Geological Institute, Russian Academy of Sciences, Moscow), who participated in collection of ammonoids; R.V. Kutygin (Diamond and Precious Metal Geology Institute, Siberian Branch, Russian Academy of Sciences, Yakutsk) for photo images of ammonoids from original collection of V.F. Vozin no. 55 kindly placed at our disposal; and also V.А. Serednev (Novosibirsk State University, Novosibirsk) for consultations and assistance in preparation of ammonoid silicone-based impressions. In addition, we are grateful to Yu.D. Zakharov (Far East Geological Institute, Far Eastern Branch, Russian Academy of Sciences, Vladivostok) for valuable comments and recommendations that contributed to improvement of this work.

This work was supported by the Research and Development Project (project no. IX. 126.1.3) under the complex program of the Siberian Branch, Russian Academy of Sciences, (program no. II. 2p “Integration and Development”).

Reviewers Yu.D. Zakharov, D.N. Kiselev and T.B. Leonova

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Correspondence to A. G. Konstantinov.

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Translated by E. Maslennikova

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Konstantinov, A.G. Ammonoids of the Genus Yakutosirenites from the Carnian Stage of Northeast Asia. Stratigr. Geol. Correl. 27, 234–247 (2019).

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