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THE REGIONAL STRATIGRAPHIC CHART FOR THE ORDOVICIAN OF TYVA (NEW VERSION)

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

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

A new version of the Regional stratigraphic chart for the Ordovician of Tyva 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 Ordovician chart were changed. Volumes of the lower, middle and upper series were also changed. For the present version of the stratigraphic chart the new standard Ordovician stages were used.

Keywords: Tyva, Ordovician, Regional stratigraphic chart, explanatory note.

DOI 10.20403/2078-0575-2021-9c-37-60