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Russian Geology and Geophysics

2015 year, number 4

ZONATION OF THE SIBERIAN ORDOVICIAN DEPOSITS BASED ON PELAGIC GROUPS OF FAUNA

N.V. Sennikov1,2, T.Yu. Tolmacheva3, O.T. Obut1,2, N.G. Izokh1, E.V. Lykova1
1A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia
3A.P. Karpinsky Russian Geological Research Institute (VSEGEI), Srednii pr. 74, St. Petersburg, 199106, Russia
Keywords: Graptolites, conodonts, Ordovician, zones, stratigraphy, Siberia

Abstract

We summarize data on the biostratigraphic units of the Siberian Ordovician deposits based on pelagic groups of fauna: graptolites, conodonts, and chitinozoans. It is shown that graptolite and conodont zones and beds have a high potential for correlation. We have determined the precise zonal position of most of the lower boundaries of the Ordovician stages and informal Ordovician substages of the International Stratigraphic Chart in the Lower Paleozoic key sections of the Taimyr Peninsula, Siberian Platform, and Altai-Sayan Folded Area.

DOI: http://dx.doi.org/10.1016/j.rgg.2015.03.010