Geologicheskii Vestnik

On the territory of the Toratau geopark, Precambrian formations are exposed in the form of beautiful, high cliff s along the tops and slopes of mountains and ranges, along the banks of rivers and streams in the mountainous part of the Southern Urals, where they are represented by sediments of the Karatau Upper Riphean series and Vendian Asha Series in the age range 542–1030 million years. The article considers the main features of the geological structure, compositional features, structure and thickness of deposits of the Upper Precambrian, which make up the core and wings of the Alatau anticlinorium, which complicates the western wing of the Bashkirian meganticlinorium, the largest structure of the Central Ural megazone. When characterizing the stratigraphy of Precambrian deposits within the boundaries of the Toratau geopark, an updated stratigraphic scheme is used, which takes into account new materials on the dating of events and the age of the Riphean and Vendian boundaries in the Southern Urals. On the territory of the geopark there are stratotypes of the Kukkarauk and Zigan Formation and a representative section of the Basa Formation of the Vendian Asha Series. Sections of sediments of the Basa, Kukkarauk and Zigan Formations of the Alatau anticlinorium are also standard for the molasse Formation and can serve as markers for the global correlation of folded complexes. The stratigraphic completeness of the geological sections of the Riphean and Vendian deposits in the Alatau anticlinorium, their accessibility and magnifi cent mountain landscapes make this part of the geopark territory a kind of testing ground for comprehensive study and organizing of geological excursions and fi eld geological practice for students of geological universities.

Riphean,Vendian, Karatau, Asha Series, Formation, geopark, Southern Urals

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