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REVISION RESULTS FOR THE MAIN OUTCROPS OF THE KOSHAGACHSKAYA FORMATION (UPPER OLIGOCENE – LOWER – MIDDLE MIOCENE) IN THE SAMAKHA-DZHAZATOR DEPRESSION IN THE SOUTH-EAST OF GORNY ALTAI

G. G. Rusanov 1, O. B. Kuzmina 2, M. V. Mikharevich 3

1 Gorno-Altaiskaya expedition of Siberian Production Geological Association, Maloeniseyskoye village, Altai Kray, Russia; 2 A.A.Trofimuk Insitute of Petroleum Geology and Geophysics, Novosibirsk, Russia; 3 Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia

The revision results for the main outcrops are given, as also new sections of the Koshagachskaya Formation and sediments overlying it are studied in the southeastern part of Gorny Altay. On the ground of a comprehensive study, including lithological, mineralogical, geochemical, palynological and paleocarpological analyses of sediments, the upper part of the Koshagachskaya Formation of the Early – Middle Miocene was identified in the valley of the Dzhazator River lower reaches and in the Samakha basin, where the upper part of the Kalimkungey section was excluded from the formation structure.

Keywords: lithology, mineral composition, micropaleontology, Koshagachskaya Formation, Upper Oligocene, Miocene, Samakha depression, Dzhazator depression, Gorny Altai.

DOI 10.20403/2078-0575-2022-1-14-25

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