Abstract
The results of the study of organic-walled microphytoplankton (dinocysts, acritarchs, green algae) found in rock deposits of the Mesozoic age (Middle Jurassic - 161-165 Ma) in central Ukraine are presented. Rock samples were collected from outcrops in the vicinity of Kaniv (Cherkasy Region) and boreholes in Pereyaslav-Khmelnytsky district of Kiev Region. In the deposits of the Kaniv outcrops, the Callovian complex of dinocysts, acritarchs and prazinophytes were revealed. The presence of Ctenidodinium ornatum (Eisenack) Deflandre indicates late Callovian age. In the rock samples from the boreholes of the study area, a dinocyst complex corresponding to the Ctenidodinium ornatum-Ctenidodinium continuum zone was found. According to the 2008 International scale, it corresponds to the upper and middle Callovian. The paleoecological interpretation of the described dinocyst associations testifies that the Callovian Basin was normally a salty warm-water sea. The revealed organic-walled complex in the study area is confined to coastal and shallow marine facies.
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