Foraminiferal complex age in the typical location of the  Viseidiscus primaevus  index taxon (Pronina, 1963)

T. I. Stepanova

doi:10.24930/2500-302X-2026-26-1-144-169

Foraminiferal complex age in the typical location of the Viseidiscus primaevus index taxon (Pronina, 1963)

T. I. Stepanova

https://doi.org/10.24930/2500-302X-2026-26-1-144-169

EDN: LIDZQW

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Abstract

Research subject. Collection of thin sections containing foraminifera of the Lower Visean Substage of the lower section of the Syrtinsky carboniferous system, located on the left bank of the Ural River to the northwest of the Syrtinsky village within the Shartym–Kizilskoe–Urtazym district, Magnitogorsk structural-facies megazone of the Southern Urals eastern slope. The collection, founded by T.V. Pronina, is stored at the Laboratory of Stratigraphy and Paleontology of the Institute of Geology and Geophysics of the Ural Branch of the Russian Academy of Sciences in Yekaterinburg (Russia). From this locality, the holotype of the Permodiscus (?) primaevus species, Pronina, 1963 comes from, which is one of the zonal taxa of the Lower Carboniferous foraminiferal sequence. Aim. Comprehensive characterization of the foraminiferal community containing this taxon and clarification of its systematic position taking into account all the latest research on this issue. Materials and methods. Micropaleontological studies of the collection of thin sections from the location of the Permodiscus (?) primaevus holotype. Results. A comprehensive paleontological characterization of the microfauna complex from the Syrtinsky location was carried out; the facial confinement of carbonate deposits in the location was considered. The studied foraminiferal association contains numerous taxa typical of the Early Visean interval of the section. The presence of archaediscids of the Ammarchaediscinae subfamily, including the Permodiscus (?) primaevus holotype, in the absence of representatives of the Uralodiscus genus, makes it possible to attribute this complex to the Viseidiscus primaevus–Eoparastaffella subglobosa zone, which characterizes the Burlin regional substage of the East Ural subregion. A systematic description of the Viseidiscus genus and its type species is given, along with some representatives of the Eoparastaffella genus, Pseudoendothyridae family, such as E. tumida, E. florigena, E. expleta, first isolated by T.V. Pronina in the deposits of the Lower Visean substage and encountered in this locality. Conclusions. The representative association of foraminifera, including zonal species, allows the stratigraphic position of the host rocks to be unequivocally determined. The deposits with this foraminiferal complex are widely traced in the Lower Visean carbonate formations of the Urals western slope, in the Don–Dnieper region, in the Franco–Belgian stratotype, where it corresponds to the Mississippian Foraminiferal zone MFZ10, and in other regions of Eurasia.

Keywords

foraminifera, Ammarchaediscinae, Pseudoendothyridae, Lower Visean, Urals

About the Author

T. I. Stepanova

A.N. Zavaritsky Institute of Geology and Geochemistry, UB RAS
Russian Federation

Tatiana I. Stepanova

15 Academician Vonsovsky st., Ekaterinburg 620110

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Review

For citations:

Stepanova T.I. Foraminiferal complex age in the typical location of the Viseidiscus primaevus index taxon (Pronina, 1963). LITHOSPHERE (Russia). 2026;26(1):144-169. (In Russ.) https://doi.org/10.24930/2500-302X-2026-26-1-144-169. EDN: LIDZQW

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