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Russian Geology and Geophysics

2014 year, number 8

THE NEW ORDOVICIAN STAGE STANDARD AS APPLIED TO THE STRATIGRAPHIC UNITS OF THE WESTERN ALTAI-SAYAN FOLDED AREA

N.V. Sennikov1, E.V. Lykova1, O.T. Obut1, T.Yu. Tolmacheva2, N.G. Izokh1
1A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2A.P. Karpinsky Russian Geological Research Institute, Srednii pr. 74, St. Petersburg, 199106, Russia
Keywords: Ordovician, new stage standard, biostratigraphy, graptolite and conodont zones, horizon, Altai-Sayan Folded Area

Abstract

Data are provided on the new Ordovician stage standard of the International Stratigraphic Chart: Tremadocian, Floian, Dapingian, Darriwilian, Sandbian, Katian, and Hirnantian. Graptolite and conodont zonal and infrazonal successions are used for a precise estimation of the chronostratigraphic position of the boundaries of the previous and newly proposed Ordovician regional stratigraphic units (horizons) in the western Altai-Sayan Folded Area. The chronostratigraphic position of the boundaries of most of the Ordovician formations showing a wide lateral distribution in southern Siberia has been described in detail in terms of the new stage standard of the General Stratigraphic Scale of Russia.

DOI: http://dx.doi.org/10.1016/j.rgg.2014.07.005