The paper presents some preliminary results of comprehensive geoarcheological researches of Middle Paleolithic open-air sites, situated at the different regions of the Russian plain, which had been continued after a short pause. Our issue focused on the main key-sites from Upper Desna (Khotylevo I and Betovo) to the Lower Volga (Suhaya Mechetka), Northern Azovian sea-coast (Rojok I and Nosovo I), Middle (Shlyah) and Lower (Birjuchaya Balka 2) Don regions. Those studies conducted at a new methodological level during the last five years have allowed us to obtain new information on the chronological and lithologic-stratigraphic positions of sites, the degree of preservation of Cultural layers and the peculiar features of those assemblages. A table with series of uncalibrated radiocarbon dates demonstrates the variants of correlation of complexes in the interval from the second half of the middle (MIS-3) to the beginning of the later (MIS-2) part of the Valdaï period.