The article is devoted to the results of the study of organic-walled-microphytoplankton (dinocysts, acritarchs, green algae), set in the rocks of Callovian age (Middle Jurassic – 161–165 Ma) in the central part of Ukraine. The studied Callovian microphytofossils complexes in Macerata rock samples from outcrops vicinity of Kanev (Cherkassy region) and wells drilled in Pereyaslav-Khmelnytsky district of Kiev region were first described. A detailed systematic study of microphytofossils Callovian Stage allowed to draw conclusions about the conditions of paleobionomical sedimentation basin and to clarify the geological age of rocks and their host residues.

Keywords: Dinocysts, acritarchs, green algae, Callovian deposits, central Ukraine

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