Solving of geologic problems by means of the petrologic analysis

Petrographic analysis of the Upper Kama region rocks made a clear distinction between the complexes of the Permian grauwack sandstones and the Jurassic arcos ones. The level of ironbearing conglomerates is found in the Middle Jurassic. The criteria of the local explosive-injective magmatism are distinguished for the first time and the most long-range diamond research areas are marked.