New materials on the lithologic composition, character of the boundaries between the subsuites and paleontologic age determinations are presented. Those were obtained upon stydying the well copes from the North of the Don-Medveditsa Dislocations. The data analysis has allowed to divide the depositions in new place of the Volga Region in subsuites. Those are corresponding to standart ammonite zones and peculiar for foraminifer assemblages of their own.
