THE PRIDOLI (SILURIAN) LITHOSTRATIGRAPHY AND BIOSTRATIGRAPHY OF GORNY ALTAI
N.V. Sennikov1,2, N.V. Novozhilova1,2, O.T. Obut1,2, R.A. Khabibulina1
1Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, 630090, Novosibirsk, Russia
2Novosibirsk State University, ul. Pirogova 1, Novosibirsk, 630090, Russia
Keywords: Lithostratigraphy, biostratigraphy, conodonts, Pridoli, Silurian, Devonian, Cherny Anui Formation, Gorny Altai
Abstract
The paper presents new data on the upper Silurian litho- and biostratigraphy of the Gorny Altai area. Sediments within this interval store a succession of taxonomically representative middle-upper Ludfordian, lower Pridoli, and Lower Devonian (Lochkovian-Pragian) conodont assemblages. The new fauna constraints made a basis for updated correlations of the local and regional stratigraphic units at the Silurian/Devonian boundary of Gorny Altai with the stages of the International Stratigraphic Chart. The correlation results reveal a mismatch between the boundaries of the local and regional Silurian units and the respective boundaries of stages in the International Stratigraphic Chart.
|
