Abstract
This paper presents results of diatom analyses of dated Upper-Pleistocene lacustrine deposits from the Shapkina river in the Bolshezemelskaja tundra of the USSR. Both diatom systematics and palaeoecology have been studied.
A marine diatom assemblage was found in the lower part of the sedimentary sequence and a rich freshwater assemblage, including more than 200 taxa, was found in the upper part. Some of the characteristic diatoms are typical of standing or slowly-moving waters of more southern and western districts but are not found in the Bolshezemelskaja tundra lakes today.
According to 14C dating, the age of the deposit is about 40 000 years, and represents the Middle-Valdaj (Middle-Weichselian). Palynological and diatom analysis suggest that the climate was similar to the present, that of an interglacial.
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References
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Loseva, E. The Middle-Valdaj Lakes in the Western part of the Bolshezemelskaja tundra. Hydrobiologia 103, 275–279 (1983). https://doi.org/10.1007/BF00028466
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DOI: https://doi.org/10.1007/BF00028466