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THE REGIONAL STRATIGRAPHIC CHART FOR THE SILURIAN OF THE WESTERN PART OF THE ALTAI-SAYAN FOLDED AREA (NEW VERSION)

N. V. Sennikov 1, 2, O. T. Obut 1, 2, N. G. Izokh 1, R. A. Khabibulina 1, O. A. Rodina 1, E. V. Lykova 1, T. P. Kipriyanova 1

1 Trofimuk Institute of Petroleum Geology and Geophysics of SB RAS, Novosibirsk, Russia; 2 Novosibirsk National State Research University, Novosibirsk, Russia

A new version of the Regional stratigraphic chart for the Silurian of the western part of the Altai-Sayan Folded Area and explanatory note, compiled in accordance with the Russian Stratigraphic Code, introduce changes, additional and specified data in comparison with the previous (third edition) chart. The Interdepartmental stratigraphic meeting held at Novosibirsk in 1979 approved the old version of the chart and later it was validated by the USSR Interdepartmental Stratigraphic Committee as the official stratigraphic base for all types of the regional geologic activities. Since 1979 meeting, the stages of the Silurian chart were changed. Thus, former stages Llandovery, Wenlock, Ludlow and Pridoli become series. New stages Rhuddanian, Aeronian, Telychian, Sheinwoodian, Homerian, Gorstian and Ludfordian were adopted for the three former series. For the presented stratigraphic chart the new standard Silurian stages were used. We detalaized stratigraphic subdivision – seven horizons were defined instead of former four.

Keywords: Western part of the Altai-Sayan Folded Area, Silurian, Regional stratigraphic chart, explanatory note.

DOI 10.20403/2078-0575-2019-8s-106-134