JURASSIC AND CRETACEOUS STRATIGRAPHY OF THE ANABAR AREA (
Arctic Siberia, Laptev Sea coast) AND THE BOREAL ZONAL STANDARD
B.L. Nikitenko, B.N. Shurygin, V.G. Knyazev, S.V. Meledina, O.S. Dzyuba, N.K. Lebedeva, E.B. Peshchevitskaya, L.A. Glinskikh, A.A. Goryacheva, S.N. Khafaeva
Keywords: Jurassic, Cretaceous, stratigraphy, Boreal Zonal Standard, ammonites, belemnites, bivalves, foraminifers, ostracodes, dinoflagellate cysts, spores and pollen, Siberia, Anabar area
Abstract
Recent integrated studies of Mesozoic key sections of the Anabar area (northern Central Siberia, Laptev Sea coast) and the reinterpretation of previous data based on a modern stratigraphic model permit considerable improvement of the bioand lithostratigraphic division and facies zoning of the Jurassic and Cretaceous sediments in the region. Analysis of abundant paleontological data permitted the development or considerable improvement of zonal scales on ammonites, belemnites, bivalves, foraminifers, ostracodes, dinocysts, and terrestrial palynomorphs from several Jurassic and Cretaceous intervals. All zonal scales are calibrated against one another and against regional ammonite scale. The analysis of the lateral sistribution of fossils in different regions of the Northern hemisphere permits the recognition of reference levels for interregional correlation and the suggestion of parallel zonal scales within the Boreal Zone standard for the Jurassic and Cretaceous. A combination of these scales forms an integrated biostratigraphic basis for a detailed division of Boreal-type sediments regardless of the place of their formation and comparison with the international stratigraphic standard as far as the possible use of a set of correlation reference levels.
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