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Paleophytogeography of the Siberian Paleofloristic Region in the Early Jurassic and First Half of the Middle Jurassic

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The results of a comparative analysis of taphofloras of the Early Jurassic and first half of the Middle Jurassic of the Siberian paleofloristic region are considered. For this time interval, a significant similarity in the systematic composition of the taphofloras of Western Siberia and Northern China is revealed. Based on the author’s data and the published data, the position of the boundary in the south and southwest of the Siberian paleofloristic region and the boundary between its West Siberian and North China provinces are corrected. The refined systematic composition of paleofloras, the constant presence of numerous remains of leaves of deciduous gymnosperms in the sediments, and the sedimentological features of flora-bearing strata taken together convincingly confirm the fact that the climate throughout the entire Siberian region in the Early Jurassic and first half of the Middle Jurassic was humid with seasonal fluctuations in temperature and humidity. The paleogeographic features of the northeast of the Siberian paleofloristic region are briefly considered.

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Fig. 1.

Notes

  1. The floristic assemblage, the “face” of any flora (including paleoflora), is a collection of species, genera, and families that arose simultaneously, under certain conditions and later shared the same fate; “… the assemblage has remained almost unchanged for quite a long time” (Popov, 1963, p. 21).

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ACKNOWLEDGMENTS

The authors thank Doctor of Geological Mineralogical Sciences A.B. German and Doctor of Biological Sciences L.B. Golovneva for their valuable advice and comments.

Funding

The study was carried out as part of the state assignments of the Botanical Institute of the Russian Academy of Sciences (subject no. AAAA-A19-119021190031-8) and the Geological Institute of the Russian Academy of Sciences (subject no. 0135-2019-0045).

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

    A. I. Kiritchkova & N. V. Nosova

  2. Geological Institute, Russian Academy of Sciences, Moscow, Russia

    E. I. Kostina

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Kiritchkova, A.I., Kostina, E.I. & Nosova, N.V. Paleophytogeography of the Siberian Paleofloristic Region in the Early Jurassic and First Half of the Middle Jurassic. Dokl Biol Sci 507, 327–340 (2022). https://doi.org/10.1134/S0012496622060072

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