The first record of calcareous dinoflagellate cysts from the Upper Cretaceous of the Volga River Region

Аннотация

The taxonomic position of the microproblematics previously considered to be Foraminifera or Calcisphaerulidae is established. The first record from Russia of calcareous cysts of Dinoflagellata is presented. The microfossils originate from the Maastrichtian siliceous clay of the Volga River Region.