This article includes the results of the electron microscope (EM) study and the first taxonomic description of 13 calcareous nannofossil species from the Paleocene-Eocene sediments from the borehole material of Northern Precaucasus and the south-eastern part of the Great Donbas. The described species belong to the families of Helicosphaera, Chiasmolithus and Nannotetrina.
Keywords: Nannoplankton, Paleocene-Eocene, Northern Precaucasus, south-eastern part Donbas, taxonomic description
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