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Biochronological Scale of the Upper Toarcian–Lower Aalenian of Eastern Siberia by Bivalve Mollusks of the Genus Arctotis Bodylevsky, 1960

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Abstract

On the basis of the study of shell morphogenesis, the classification of the Toarcian–Aalenian representatives of the genus Arctotis Bodylevsky, 1960 was refined. A sequence of species was established in the reference sections of Anabar Bay and Cape Tsvetkov (Eastern Taimyr), traced in a series of Toarcian and Aalenian sections in Eastern Siberia, and correlated with the Boreal ammonite scale. The biochronological scale was developed for the upper Toarcian–lower Aalenian on the basis of bivalve mollusks of the genus Arctotis (family Oxytomidae Ichikawa, 1958). This scale has its own chronological periodization and consists of four so-called oxyto-zones. The scale was used to carry out an interregional correlation of the upper Toarcian–lower Aalenian sections of Eastern Siberia (Anabar Bay, Cape Tsvetkov, Markha, Tyung, Kelimyar, Molodo, and Motorchuna rivers, boreholes drilled in the Vilyui syneclise) and northeastern Russia (Levy Kedon River basin). The chronostratigraphic volumes of oxyto-zones are determined by comparison with ammonite zones of the Boreal Standard: the Praearctotis milovae oxyto-zone corresponds to the Zugodactylites braunianus and Pseudolioceras compactile ammonite zones, the Praearctotis marchaensis oxyto-zone corresponds to the Pseudolioceras wuerttenbergeri Zone, the Praearctotis similis oxyto-zone corresponds to the Pseudolioceras falcodiscus Zone, and the Arctotis tabagensis oxyto-zone corresponds to the Pseudolioceras maclintocki Zone.

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Notes

  1. Later, this group of species was assigned to the genus Arctotis (Bodylevsky, 1960). Bodylevsky used the name Arctotis lenaensis (Lah.) for the Aalenian–Bajocian forms and Arctotis sublaevis (Bodyl.) for the Bajocian–Bathonian forms (Bodylevsky, 1957). Later, the name Arctotis lenaensis has become widely accepted in the stratigraphic correlations since this species was chosen as the index species for the lower Aalenian–lower Bajocian bivalves (Shurygin et al., 2000). The revision of the Jurassic and Cretaceous oxytomids has revealed that the lectotype of the species Arctotis lenaensis (Lah.), selected by V.I. Bodylevsky, comes from the Bathonian deposits (Zhigansk area), and the holotype of Arctotis sublaevis (Bodyl.) comes from the Aalenian–Bajocian deposits of the Nordvik region. Therefore, the name Arctotis sublaevis (Bodyl.) is used in this work, instead of “Arctotis lenaensis,” to refer to the Siberian late Aalenian–Bajocian Arctotis species and for the Bathonian representatives, Arctotis lenaensis (Lah.). This issue was discussed in detail earlier (Lutikov and Shurygin, 2010). Below in the text, the names of taxa whose volume is interpreted by the author differently than that used in previous studies and the names of taxa that should be revised are given in quotation marks. The names of zones and layers with bivalves are given in their original form.

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ACKNOWLEDGMENTS

I want to express gratitude to my colleagues, having participated in joint fieldworks, V.P. Devyatov (Siberian Research Institute of Geology, Geophysics, and Mineral Raw Materials, Novosibirsk), V.G. Knyazev (Diamond and Precious Metal Geology Institute, Siberian Branch of Russian Academy of Sciences, Yakutsk), and I.V. Sapyanik (Siberian Research Institute of Geology, Geophysics, and Mineral Raw Materials, Novosibirsk), who kindly provided the additional material on the lithological and paleontological characteristics of the sections.

I am grateful to Yu.S. Repin (All-Russian Petroleum Research Exploration Institute, St. Petersburg) and M.A. Rogov (Geological Institute, Russian Academy of Sciences, Moscow) for essential consultations during the preparation of this work and B.N. Shurygin (Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk), A.S. Biakov (North-East Interdisciplinary Scientific Research Institute, Far Eastern Branch, Russian Academy of Sciences, Magadan), and V.S. Vishnevskaya and Yu.B. Gladenkov (Geological Institute, Russian Academy of Sciences, Moscow) for some valuable comments and recommendations that helped to improve the manuscript.

I want to express my sincere gratitude to all the specialists listed for their help in preparing the manuscript.

I want to express my special gratitude to my scientific supervisor V.A. Zakharov (Geological Institute, Russian Academy of Sciences, Moscow) for the essential advice during the research and the preparation of this article.

Funding

This work was performed within the framework of state assignment of the Geological Institute, Russian Academy of Sciences, supported by the Russian Foundation for Basic Research and National Center for Scientific Research of France within the framework of research project no. 21-55-15015.

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Lutikov, O.A. Biochronological Scale of the Upper Toarcian–Lower Aalenian of Eastern Siberia by Bivalve Mollusks of the Genus Arctotis Bodylevsky, 1960. Stratigr. Geol. Correl. 29, 680–709 (2021). https://doi.org/10.1134/S086959382106006X

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