title: Some Calcareous Nannofossils from the Upper Jurassic-Lower Cretaceous Bazhenov Formation of the West Siberian Marine Basin, Russia
abstract: Six species of four calcareous nannofossil genera (Ellipsagelosphaera Nol,1965, Watznaueria Reinhardt, 1964 Stratigraphically, the presence of the species of all genera in the Bazhenov Formation corresponds to the world data. Three new species (Ellipsagelosphaera bazhenovi Zanin sp.n., Watznaueria sp. and Tetralithus isopelxiros Zanin sp.n. have been determined.
journal: The Open Geology Journal