Using nuclear geochronology method, obtained are valid uranium/thorium dates for organogenic sediments of Miculean period. It enables to identify chrono-stratigraphically doubtful organogenic sediments and assign them to certain interglacial/inter-stage period, establish the chronology for sediment formation in interglacial period using the more detailed radiochemical analysis of massive organogenic layers (above 1 m), make a considerable contribution to chronostratiography of Upper and Meso-Pleistocene on Russia territory.