Figure 4. Schematic geological map
of the Biryusa R. middle-coarse area (compiled using the field
maps of G. A. Belozerov and T. V. Gorbovskaya).
1 - Early Proterozoic granitoids of the Sayan Complex; 2-3 - Late
Riphean rocks of the Karagas Group: 2 - Shangulezh and Tagul
formations (bottom of the section), 3 - Uda Formation; 4 - Late
Riphean Nersa dolerite complex (sills and dikes); 5 - faults.