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On the Chaun Paleoflora in the Chukotka Nonmarine Cretaceous

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Abstract

The Cretaceous fossil flora in deposits of the Okhotsk–Chukotka volcanic belt is drastically different in systematic composition from the paleoflora of similar ages in deposits of the Northeast Asian coastal lowlands and inland depressions. In the volcanic burials, paleoflora features are the most evident in the Chaun flora found in the Pegtymel trough in the Central Chukotka region and described in the monograph by L.B. Golovneva “The Chaun Flora of the Okhotsk–Chukotka Volcanic Belt.” Based on these data and our own experience in studying the Okhotsk–Chukotka belt stratigraphy and the vegetation cover dynamics in the Kamchatka recent volcanism area, we have proven that the Chaun flora was formed not on the volcanic highlands, as Golovneva stated, but on the lowlands, on a periodically renewed juvenile surface of the central part of the vast volcanic field separately from the background diaspora sources. This flora is not characterized by a clear lateral and stratigraphic confinement, because the characteristic plant fossils can be found in deposits of different ages throughout the volcanic belt. They are indicative of particular vegetation and burying conditions in the surface volcanism from the Turonian to the Campanian inclusive.

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ACKNOWLEDGMENTS

We are deeply grateful to E.B. Peshchevitskaya (Institute of Oil and Gas Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk) and A.B. German (Geological Institute, Russian Academy of Sciences, Moscow) for valuable advice and recommendations for improvement of this paper.

Funding

This work was carried out under the state assignment of the Komarov Botanical Institute, Russian Academy of Sciences: “Fossil Plants of Russia and Adjacent Areas: Taxonomy, Phylogeny, Paleofloristics, and Paleophytogeography” (project no. АААА-А19-119021190031-8). In addition, the work was supported by the Russian Foundation for Basic Research (grants nos. 19-05-00121 and 19-05-00805-a).

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  1. Komarov Botanical Institute, Russian Academy of Sciences, 197376, St. Petersburg, Russia

    S. V. Shczepetov & V. Yu. Neshataeva

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  1. S. V. Shczepetov
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  2. V. Yu. Neshataeva
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Correspondence to S. V. Shczepetov.

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Recommended for publishing by G.L. Kirillova

Translated by E. Maslennikova

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Shczepetov, S.V., Neshataeva, V.Y. On the Chaun Paleoflora in the Chukotka Nonmarine Cretaceous. Russ. J. of Pac. Geol. 15, 134–143 (2021). https://doi.org/10.1134/S1819714021020068

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