title: Kazan Golovkinsky Stratigraphic Meeting 2021
abstract: Until now, definite and well-preserved Early Tournaisian radiolarians have not been known in Northern Eurasia. The only Entactiniidae gen. et sp. indet. assemblage established previously in the Peri-Caspian Basin was so taxonomically poor that it cannot be used for biostratigraphic purposes. However, the common presence of spherical radiolarians made it possible to establish beds with Entactiniidae gen. et sp. indet. (Afanasieva, 1987(Afanasieva, , 2000)), but this extremely depleted (reliably k
journal: Kazan University Press eBooks