Precambrian stratigraphy of northeastern part of Yenisey ridge

In the area between the Uvolga, Chapa, and Vorogovka rivers, all of the Tungusik, Oslyanka, and a part of the Sukhoy Pit series are missing in the Precambrian section, which consists of the following series, from the bottom up: Teya, parts of Sukhoy Pit, and Chingasan. -- V.P. Sokoloff