1. The Cambrian, Ordovician, and Silurian of Stratotype Areas [in Russian];Akhmet’ev,1976
2. Stratigraphy of the Ordovician of the Angara–Oka region;Andreeva,1959
3. Stratigraphic Section of Paleozoic Deposits in the Area of the Angarsk Rapids [in Russian];Cherkesov,1931
4. Stratigraphy of Petroliferous Basins of Siberia. The Ordovician of the Siberian Platform [in Russian];Kanygin,2007