Pleistocene stratigraphy of the Vychegda River basin, European North-East

Limited extension of the MIS 2 proglacial lake in the Severnaya Dvina valley, south‐eastern margin of the last Scandinavian Ice Sheet

“…2a) and continuing upstream. The Tolokonka and Baika sections have been previously studied by different research groups (Sidorchuk et al, 2001; Maksimov et al, 2011; Larsen et al, 2014; Lyså et al, 2014; Zaretskaya et al, 2019; 2020). In this section we present these results alongside our own findings to form a complete picture of the proglacial lake sediment structure and dating results.…”

“…9, Table 3). In the palynological spectra arboreal pollen dominates (40–70%) and the percentage of spores is significant (7–30%) (Zaretskaya et al, 2020). Trees are represented by Picea (10–30%), Pinus ( Pinus sylvestis 6–20%, Pinus sect.…”

“…There was an interesting find of Schoenus nigricans (Cyperaceae) seeds that are characteristic of the interstadial flora of Eastern Europe. The results of pollen analysis revealed a cold–warm–cold rhythm (Zaretskaya et al, 2020). At the bottom part, shrub tundra with patches of forest‐tundra (with Selaginella selaginoides ) was reconstructed; the climate was relatively cold.…”

“…Pollen analysis revealed a predominance of spruce and pine, with the presence of alder, birch and gramineous plants, characteristic of modern northern taiga coniferous forests with grassland. The presence of soil fungi Meliola and Glomus together with remnants of soil Acarians and absence of algae spores points to subaerial origin of this unit (Zaretskaya et al, 2020).…”

PALEOARC 2021 - 2nd International Conference on Processes and Palaeo-environmental changes in the Arctic from past to present

“…Our studies were motivated by the above-mentioned controversies in paleogeographic reconstructions for the Vychegda -Severnaya Dvina fluvial system. Extensive investigations through these valleys (24 new sections) allowed us to state that the alluvial and aeolian sedimentary pattern dominated within the Vychegda basin during the MIS 2 (Zaretskaya et al, 2020): the 2 nd (27-17 ka BP) and 1 st (17-11.7 ka BP) alluvial terraces had been forming, and the incision of Vychegda took place ca 17 ka BP due to probably the final drainage of the proglacial lake in the Severnaya Dvina valley and climate-driven increase of river water runoff. The LGM proglacial lake was spatially restricted within the Severnaya Dvina valley and extended upstream not more than 120 km from the ice margin established in as it was found that the lake did not reach the Vychegda -Severnaya Dvina confluence (Zaretskaya et al, 2020).…”