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THE REGIONAL STRATIGRAPHIC CHART FOR THE ORDOVICIAN OF THE WESTERN SAYAN (NEW VERSION)

N. V. Sennikov 1,2, O. T. Obut 1,2, N. G. Izokh 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 the Western Sayan and explanatory note, compiled in accordance with the Russian Stratigraphic Code 2006, introduce changes, additional and specified data in comparison with the previous (first edition) chart. The Interdepartmental stratigraphic meeting held at Novosibirsk in 1964 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 1964 meeting, the stages of the Ordovician chart were changed. Thus, instead of the traditional British stages (Tremadocian, Arenigian, Llanvirnian, Llandeilian, Caradocian, Ashgillian) the following units were adopted by the International Stratigraphic Chart – Tremadocian, Floian, Dapingian, Darriwilian, Sandbian, Katian, Hirnantian. 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: Western Sayan, Ordovician, regional stratigraphic chart, explanatory note.

DOI 10.20403/2078-0575-2021-9c-4-14