Ancient lacustrine interglacial deposits stripped in the profiles at Matveev Rov-2 (Belarus) and Adamówka-I (Poland) were correlated on the basis of local diatom assemblage zones distinguished in them and compared with pollen zones.
The same type of the diatom succession namely Cyclotella →Fragilaria is characteristic of both profiles. Cyclotella comta et var.lichvinensis et var.pliocaenica, C.michiganiana var.parvula, C.schumannii, C.temperiana are the typical diatoms in the Alexandrian (Mazovian) Interglacial.