UPPER VENDIAN NEMAKIT-DALDYNIAN STAGE IN THE SIBERIAN PLATFORM
V.V. Marusin
1Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
Keywords: Vendian, Cambrian, General Stratigraphic Scale of Russia, International Chronostratigraphic Chart, small skeletal fossils, trace fossils, chemostratigraphy, Siberian Platform
Abstract
A recent revision of stratigraphic volume and age of the Upper Vendian Nemakit-Daldynian Stage has developed its integrated (bio- and chemostratigraphic) characteristic. This unit comprises the strata between the first appearance of undisputed anabaritids in the fossil record (ca. 539 Ma) and first Tommotian small skeletal fossils of Nochoroicyathus sunnaginicus Assemblage Zone of the Lower Cambrian (ca. 530 Ma). Together with typical assemblages of skeletal fauna, the Nemakit-Daldynian Stage records specific changes in trace fossil assemblages and carbonate carbon isotope composition. Following the formulated criteria, this contribution tests how complete the geological record of the Nemakit-Daldynian Stage is in its reference sections (western Anabar Uplift) and other regions of the Siberian Platform (eastern Anabar Uplift, Olenek Uplift, Kharaulakh Uplift, Uchur-Maya region, Batom Basin, Baikal region, Irkutsk and Biryusa Cis-Sayans uplifts, southern and northern Yenisei Ridge, Turukhansk Uplift, Igarka Uplift, central Siberian Platform).
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