COMPREHENSIVE ZONAL SUBDIVISIONS OF SIBERIAN JURASSIC AND THEIR SIGNIFICANCE FOR CIRCUM-ARCTIC CORRELATIONS
B.N. Shurygina, B.L. Nikitenkoa, S.V. Meledinaa, O.S. Dzyubaa, and V.G. Knyazevb
aA.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
bDiamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences, pr. Lenina 39, Yakutsk, 677891, Russia
Keywords: Jurassic, biostratigraphy, Boreal standard, Arctic paleobasins, Siberia
Pages: 825-844
Abstract
We show the present state of the set of parallel zonal scales for the Siberian Jurassic, based on various fossil groups, and the principles of their construction. We discuss the significance of Siberian biostratigraphic scales for the Boreal zonal standard of the Jurassic units. The stratotype region for this standard must have a typical Boreal (Arctic rather than mixed) fauna. A possible candidate is Siberia (and the Arctic biochorema), which is located in the center of the Panboreal Superrealm, where the set of interrelated scales for various fossil groups is the most complete. The set of parallel zonal scales for the Siberian Jurassic is efficient for the subdivision and correlation of Jurassic units in various Arctic regions (Barents Sea shelf, northeastern Russia, Arctic Alaska, Arctic Canada).
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