A study of nannofossils and dinocysts from different types of Oligocene basins of the Northern Peri-Thetys resulted in paleoecological reconstructions. The following phytoplankton associations were recognized: cold-water; littoral shallow-water relatively cold- and warm-water; lagoon; semi-isolated with endemics. Nannofossils were present in carbonaceous sediments, with more favorable conditions for them being in the Carpathian basin of Krosnensky type, in the earliest Rupelian of Germany and Southern Ukraine. Dinocysts were identified in all types of Oligocene basins. Correlation levels identified by nannofossils and dinocysts allowed us to substantiate the lower and upper Oligocene boundaries and degree of desalination in the Middle Rupelian.

Keywords: nanofossils, dinocysts, Oligocene, paleoecology, biostratigraphy, Germany, Ukraine, Kazakhstan

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