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THE REGIONAL STRATIGRAPHIC CHART FOR THE LOWER CAMBRIAN OF THE EASTERN PART OF THE ALTAI-SAYAN FOLDED AREA

O. V. Sosnovskaia 1,2, D. A. Tokarev 3,4, I. V. Korovnikov 3,4

1 Siberian PGO, Krasnoyarsk, Russia; 2 Siberian Federal University, Krasnoyarsk, Russia; 3 Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia; 4 Novosibirsk National State Research University, Novosibirsk, Russia

The scheme is based on the stratigraphic scheme adopted at the all-Union stratigraphic meeting in Novosibirsk in 1979 and supplemented with new materials. It retains the names and age of all previously accepted horizons, expanded their paleontological characteristics. The boundaries and volumes of the Ustkundat, Natalyevka, Kameshki and Sanashtykgol horizons in their stratotype regions are specified. The lower boundary of the Cambrian is based on a complex of paleontological data, mainly on the change of algal complexes with the Korilophyton to complex with the Epiphyton. The upper boundary of the lower Cambrian is determined taking into account the correlation of the Obruchev horizon of the Altai-Sayan folded region with the Elan horizon of the lower Cambrian of the Siberian platform. The correlation part of the scheme additionally includes eight sections of Kuznetsk Alatau, Eastern Sayan and Tyva. In most columns the lithological and paleontological characteristics of the formations are supplemented and their thikness is specified. The correlation of some formations was changed. Special opinions are given, tasks of further researches are outlined. The scheme and the explanatory note to it are considered and approved by the Interdepartmental Stratigraphic Committee of Russia on April 10, 2014.

Keywords: stratigraphic chart, Cambrian, Altai-Sayan folded area.

DOI 10.20403/2078-0575-2019-8s-33-68