Geologicheskii Vestnik

The Devonian and Carboniferous stratigraphic successions of the West-Uralian Folded Zone, in the Ishimbay and Gafuri administrative districts of the Republic of Bashkortostan, are reviewed. Many key and stratotype sections of Devonian and Carboniferous regional stratigraphic units are located in this area. Most of them are exposed in natural outcrops, mainly along river banks. All sections are mainly composed of marine carbonate or carbonate-terrigenous deposits with rich fossils assemblages of benthic and pelagic organisms. Currently, the Upper Devonian and Carboniferous are subdivided into biozones based on foraminifers, ostracods, conodonts, corals, brachiopods and ammonoids, and updated stratigraphic schemes are presented. The Devonian system contains three series. The Lower Devonian is incomplete, represented only by the Emsian Stage. In the Middle Devonian, the Eifelian and Givetian stages are recognized. The Upper Devonian includes the Frasnian and Famennian stages. The Carboniferous is represented by all three series. The Devonian-Carboniferous transition is gradual; the boundary is fi xed within the Gumerovian Regional Substage (Horizon), which represents a transitional unit. The Lower Carboniferous includes the Tournaisian, Visean, and Serpukhovian stages. In the Middle Carboniferous, the Bashkirian and Moscovian stages are recognized; the Kasimovian and Gzhelian stages are recognized in the Upper Carboniferous.

Devonian, Carboniferous, biostratigraphy, reference sections, Bashkortostan, Ishimbay district, Gafuri district

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