ИСТИНА

A new stratigraphic scheme of the Late Pleistocene periglacial region of the East European Plain has been developed on the basis of study of the paleorelief, sediments, paleosols, and cryogenic horizons. OSL and 14C-dating of paleosols and sediments in Aleksandrov quarry made it possible to substantiate this scheme. The OSL date, 127 ± 8 ka BP, (beginning of MIS 5e) was obtained for a sample taken from the bottom of the Ryshkovo soil. The Seym layer formed mainly from destroyed and redeposited horizons of this soil. For the upper part of the Seym layer, OSL dates of 115 ± 7 ka BP and 112 ± 20 ka BP (MIS 5d). For Mlodat loess (MIS 5b), which separates paleosols of Early Valdai: Kukuevo and Streletsk (MIS 5c and MIS 5a), OSL dates of 91 ± 1 and 89 ± 7 ka BP were obtained. Large pseudomorphosis is confined to Selikhovodvor loess - MIS 4 (65 ± 8 ka BP). For paleosols of Middle Valdai (MIS 3), 14C-dates were obtained: Aleksandrov (53.7 ± 2.1 ka cal BP) and Bryansk soils (37.6 ± 0.7 ka cal BP). For Tuskar loess, which separates this soils, OSL dates of 50 ± 3 and 51 ± 3 ka BP were obtained. The identified paleosols correspond to the following intervals: Ryshkovo – Eemian interglacial (127-117 ka BP); Kukuevo to Amersfoort + Brørup – Saint-Germain 1 ; Streletsk – Odderade to Saint-Germain 2; Aleksandrov to Oerel; Hydrouzel to Moershoofd – Poperinge and Hengelo; and Bryansk to Stillfried B, Denekamp or Grand Bois interstadials. The participation at the Annual Meeting of the vEGU21 is supported by the Russian Foundation for Basic Research, project no. 19-29-05024 mk.