Dorysphaera

Jasper-like siliceous rocks. Volcanogenic-sedimentary deposits. Carboniferous? Voronezhskaya series. Fossil: radiolarians - Cenosphaera, Dorysphaera, Tricolocapsa, Dictyomitra, Lithomitra. In the lenses of limestone: Triticites aff. paraschwageriniformis Rasov., ex gr. arcticus (Shell.). C₃vr. (C₂ - IUGS)