NEW DATA ON EOCENE AND OLIGOCENE PHYTOSTRATIGRAPHY OF SEVERNYE-ERGENI(THE SOUTH OF THE RUSSIAN PLATFORM)

Assemblages of spores, pollen, and organic-walled phytoplankton were s tudied in the Middle Eocene-Oligocene sequence of Severnye Ergeni. The dinocyst zonal assemblages were described, surd anomalies in their co mposition related to the temperature regime and hydrology of the sea b asin were outlined. Anoxic environments in the Bartonian and Chattian time were recognized. The considerable role of the Adnatosphaeridium-G laphyrocysta-Cyclonephelium group indirectly implies a warmer state an d freshening of the sea basin of the Solenaya Balka time interval; a w armer climate is also suggested by presence of various thermophilic ta xa in pollen assemblages and by the greater amount of pollen of Fagace ae and subtropical plants.