Yanko-Hombach, Valentyna V.Янко-Хомбах, Валентина ВенедиктовнаЯнко-Хомбах, Валентина Венедиктівна2018-12-102018-12-101990Mem. Sue. Ceul.https://dspace.onu.edu.ua/handle/123456789/20316A stratigraphic scheme of the Pleistocene and Holocene, based on inferred migrations and on local adaptative response of the benthic foraminifcral assemblages to climatic forcing is here presented. About 30000 samples from holes and surface sediments collcctcd along depth transects and shore outcrops of the Black Sea, the Caspian Sea and the Sea of Azov represent the data-base for this study. Quaternary benthic foraminifera (no planktonic. form has been found ever) are represented by 165 species and subspecies from 7 families. Most of the transformations (or morphologic changes) interpreted as evolutionary changes took place in the genera Ammonia, Maye.rella, Porosononion and Elphidium. The living benthic foraminifera arc distributed on the shelf in the Black Sea, and in the inner shelf only in the Caspian Sea and in the Sea of Azov. Ecologic parameters such as salinity, water depth and temperature were measured for each species and subspecies, and a tentative ecologic classification of foraminifera has been done. The Quaternary foraminifcral assemblages are closely related to the modem ones in their paleoecologic and zoogeographic nature. This observation, which involves an evolutionary transformation of foraminifera, allows to subdivide stratigraphically the sections considered, and allows to interpret the Quaternary deposits of the Southern Seas of the USSR in term of biofacies and paleogcography.enbenthic foraminiferaQuaternarystratigraphybiofaciespaleogeographic analysesArticle