Geologicheskii Vestnik

The article presents the lithological and petrographic characteristics of the Upper Precambrian deposits, penetrated by the deep well 40 Krasnousolskaya in the Pre-Uralian foredeep, and the stratigraphic subdivision of the well section based on the refi ned Stratigraphic scheme of the Riphean and Vendian deposits of the Volga-Uralian area (VUA). By analogy with the Riphean-Vendian formations of the reference sections of the wells of the Volga-Uralian area in the well 40 Krasnousolskaya at the depth interval 1710–4100 m the Priyutovskaya, Shikhan, and Leuza Formations of the Abdulino series of the Upper Riphean were distinguished; the Sergeevskaya Formation of the Lower Vendian and the Baikibashevo, Staropetrovskaya, Salikhovo, and Karlinskaya Formations of the Upper Vendian. For the first time, the well penetrated the upper stratum of the Leuza Formation, which supplements the stratigraphic volume and thickness of the upper Riphean section of the VUA. The materials obtained are of particular importance for clarifying the geological structure of the Precambrian formations in this part of the Pre-Uralian foredeep.

stratigraphy, lithology, Formation, Riphean, Vendian, well, Volga-Uralian area

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