The lithological composition of bottom sediments from the basins of the studied lakes, as well as diatom and radiocarbon dating data showed that in the Kolvitskaya depression, inherited by the Kolvitsa and Tiksha river valleys, the sea shoreline 10610 ± 220 years ago located at an altitude of about 75 m a. s. l. and 7270 ± 90 years ago – at an altitude of about 43 m a. s. l. In the bottom sediment successions, these spatial and temporal boundaries correspond to the change of minerogenic sediments with marine and brackish-water diatoms by organogenic sediments with freshwater diatoms.
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Korsakova et al. (2024) studied this question.
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