Summary
On the basis of the diatom analysis of lacustrine sediments recovered by the BDP-98 drill core in the depth interval 600-221 m, eight successive periods in the development of the Lake Baikal diatom flora during the late Miocene have been distinguished. They differ by the specific generic and species composition of the diatoms, and clearly reflect the sedimentation conditions in the ancient paleobasin (the gradual facial changes from distal deltaic sequences to fine hemipelagic deposits). The late Miocene diatom flora of Lake Baikal is characterized by the presence in its composition of the biochronologically important extinct genus Mesodictyon Theriot & Bradbury, and by the evolutionary appearance, blooming, and extinction of the new genus Mesodictyopsis Khursevich, Iwashita, Kociolek & Fedenya, gen. nov., as well as by the occurrence of new freshwater extinct taxa of Alveolophora, Concentrodiscus, and Actinocyclus. Moreover, the extinct species are typical not only within the centric diatom genera mentioned above, but also within certain pennate ones.
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Khursevich, G.K., Karabanov, E.B., Kuzmin, M.I., Williams, D.F., Prokopenko, A.A., Fedenya, S.A. (2003). Diatom Succession in Upper Miocene Sediments of Lake Baikal from the BDP-98 Drill Core. In: Kashiwaya, K. (eds) Long Continental Records from Lake Baikal. Springer, Tokyo. https://doi.org/10.1007/978-4-431-67859-5_17
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DOI: https://doi.org/10.1007/978-4-431-67859-5_17
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