CORRELATION OF THE EOCENE MARINE-SEDIMENTS FROM NORTHWESTERN EURASIA (WEST SIBERIA AND THE VOLGA REGION) BASED ON MICROPHYTOFOSSILS

Detailed Paleogene stratigraphy is based nowadays on the zonal schemes of different microfossil groups. The specific character of their deve lopment and the use of microphytofossil zonations in the regional stra tigraphy of various North Eurasian regions within the former USSR are shown using Eocene sediments as an example. In addition to the subglob al nannofossil zonations and the European dinocyst zonation approved b y the Interdepartmental Stratigraphic Committee (ISC), we used the zon al schemes based on diatoms and silicoflagellates and the interregiona l palynostratigraphic scale. The subdivisions of different zonations w ere correlated to substantiate the stratigraphic position of local and regional stratigraphic units in the standard Eocene scale using Meyen 's concept of the chronostratigraphic interchangeability of characteri stics.