Geologicheskii Vestnik

The species diversity of foraminifers of the superfamily Bradyinoidea Reitlinger, 1950 from the upper Visean and the lower Serpukhovian substage is characterized. These deposits were investigated in the sections of the Preduralskaya-106 borehole of the East European Platform, the Sikaza 2 site of the western slope of the Southern Urals and the Bolshoy Kizil site of the eastern slope of the Southern Urals. Totally, 76 shells of Bradynoidea were identified: 4 species belong to Janischewskina Mikhailov, 1935, emend. Mikhailov, 1939 genus and 3 species were attributed to Bradyina Moeller, 1878 genus. The stratigraphic distribution of taxa is from the Aleksinsky horizon of the Visean Stage to the Lower Serpukhovian substage. The large number of representatives of the Bradyinoidea indicates similar favourable conditions for the development of foraminiferal fauna in the Late Visean in the study area.

Southern Urals, foraminifera, Visean Stage, East European Platform

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