Geologicheskii Vestnik

Object of study. Deposits of the Asha series of the Vendian of the eastern flank of the Avdyrdak anticline, divided by a meridional fault into two monoclinal blocks, in which researchers give different stratigraphic interpretations of the sections. Results. A study was made of the deposits of the Asha series of the eastern flank of the Avdyrdak anticline along the highway (80K-031) Ufa — Beloretsk, where these deposits are most fully exposed by road cuttings and quarries. Detailed descriptions and sketches of fragments of the sediment section are given, the lithological and petrographic composition of the rocks, their ratio and thickness in the sections of the western and eastern tectonic blocks are specified. Conclusions. It has been established that according to the lithologic-petrographic composition of the rocks and the structure of the sections of the Asha series of the Vendian of the eastern flank of the Avdyrdak anticline along the highway (80K-031) Ufa-Beloretsk, the western and eastern tectonic blocks of the structure are composed of deposits of the Basa, Kukkarauk and Zigan formations. The stratigraphic similarity of the sections of the western and eastern tectonic blocks of the eastern flank of the Avdyrdak anticline indicates the thrust character of tectonic movements.

Southern Urals, Bashkirian meganticlinorium, Lower Riphean, correlation. fine-grained clastic rocks, geochemistry

• Geological map of the USSR at a scale of 1:200 000 with an explanatory note. The sheet N-40‑XVI. Series Southern Urals [Geologicheskaya karta SSSR masshtaba 1:200 000 s ob’yasnitel’noi zapiskoi. List N-40‑XVI. Seriya Juzhno-Ural‘skaya].
• Yakovlev G.B., Ivanov A.I. (ed.). M.: GOSGEOLTEKHIZDAT, 1962. 86 p. (In Russian).
• Sergeeva N.D., Puchkov V.N., Krasnobaev A.A., Kozlova O.V., Ratov A.A. (2019). Asha Series of Vendian: an orogeniccomplex of Timanides in the Southern Urals. Geologicheskii vestnik, №1 (3), 3–34. DOI: 10.31084 / 2619‑0087‑2019‑1‑1. (In Russian).
• State geological map of the Russian Federation, scale 1: 200 000 with an explanatory note. Second edition. Series Southern Urals. The sheet N-40‑XVI (Inzer) [Gosudarstvennaya geologicheskaya karta Rossiiskoi Federatsii masshtaba 1: 200 000 s ob’yasnitel’noi zapiskoi. Izdanie vtoroe. Seriya Juzhno-Ural‘skaya. List N-40‑XVI (Inzer)].
• Knyazev Yu.G., Knyazeva O.Yu., Aidarov E.M.,Bykova L.S., Zakirova V.V. M.: Moscow branch of FGBU „VSEGEI“, 2018. 129 p. (In Russian).
• Stratigraphic schemes of the Urals (Precambrian, Paleozoic). Interdepartmental Stratigraphic Committee of Russia [Stratigraficheskie skhemy Urala (Dokembrii, paleozoi). Mezhvedomstvennyj Stratigraficheskii Komitet Rossii]. Yekaterinburg, 1993, 151 diagrams, 152 pages. (In Russian).