Berezovsky A. Bivalves Middle and Upper Eocene platform Ukraine: taxonomic revision, evolution, paleogeography and paleoecology.

The thesis is devoted to a detailed study of bivalves of Middle and Upper Eocene platform of Ukraine, to identify their values for the subdivision and correlation of Eocene sediments. The audit of all discovered on the territory of Ukraine platform Eocene species and genera bivalves has been done. 344 species and 41 subspecies are described and illustrated . In the descriptions of 68 genera and subgenera are included additions, clarifications or corrections. 310 species have changed birth or subgenera names. Were 52 species found in previous studies eliminated . The conditions of habitat and geographical range of all the above taxons in the Eocene seas of the Ukraine were studied. The estimation of the rate of evolution of species in the normal marine Eocene basins of the Ukraine was done. The hypothesis about the center of education latdorfsk's shellfishes was proposed. A new stratigraphic scheme for subdividing the Eocene deposits of the southern slope of the Ukrainian shield. A biostratigraphic scheme (of bivalves) correlation Stratum Middle and Upper Eocene of southern and northern Ukraine was worked out.