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Based on a comprehensive analysis of lithologic-petrographic and mineralogic features of rocks of Vendian Asha molasse in typical sections of Alatau anticlinorium on the western wing of the Bashkirian meganticlinorium, the lithologic-petrographic and mineral composition of the Basa, Kukkarauk and Zigan Formations are  specified,  as belonging  to a  typical molasse. The  ratios of  rock-forming components  in the sandstones of molasse, shown on QFL-diagrams, indicate the formation of the considered sediments in a setting corresponding to an orogenic region (a collision zone). The close mineral composition of the heavy fraction and the similar typomorphism of the main accessory minerals (zircon, apatite, garnet, rutile and tourmaline) are due to a similar complex of rocks in the provenance area. However, depending on the stratigraphic position of the sediments and the location of the sections, the ratio and importance of minerals in the association changes, which is due to the important role of local sources of demolition for the separate sedimentary basins of Asha molasse. The essentially  garnet  association with a  significant  concentration of  epidote  is  characteristic of the Asha molasse of the eastern and western wings of the northern part of the Alatau anticlinorium, while the content of garnet and epidote decreases from the eastern to the western sections. This means that the main area of erosion in the Basa, Kukkarauk, and Zigan times was located east of the sedimentary basin.

Lithologic-petrographic and mineralogic features of Asha Vendian molasse in the Southern Urals