New data on biostratigraphy of the Vendian Nemakit-Daldynian stage in the southern Siberian platform

Abstract

New paleontological finds in sediments of the Upper Vendian Nemakit-Dadynian Stage from different areas of the southern Siberian Platforms (Yenisei Range, Sayany region, central areas, Patom Highland) are discussed. The base of the Lower Cambrian Tommotian Stage (∼540 Ma) is established at the first appearance level of characteristic small-shelled fossils in the western part of the Patom Highland. This boundary coincides with the episode of a brief sea-level fall and enhanced terrigenous sedimentation in the basin with dominant carbonate sediment deposition. The base of the Purella antiqua Zone (544 Ma), which is registered by paleontological data in the Yenisei Range sections, is marked by the replacement of terrigenous sedimentation by the carbonate one. In the northwestern Yenisei Range, this boundary coincides, in addition, with a major hiatus and subsequent paleobasin extension. The base of the Nemakit-Daldynian Stage (base of the Anabarites trisulcatus Zone, ∼550 Ma) in most sections corresponds to the onset of sea transgression. In addition to small-shelled remains, sediments of this zone contain characteristic ichnofossils and Vendotaenia flora. It is shown that defined boundaries are traceable through the entire southern part of the Siberian Platform. This makes them useful for wider stratigraphic interpretations.

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Correspondence to B. B. Kochnev.

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Original Russian Text © B.B. Kochnev, G.A. Karlova, 2010, published in Stratigrafiya. Geologicheskaya Korrelyatsiya, 2010, Vol. 18, No. 5, pp. 28–41.

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Kochnev, B.B., Karlova, G.A. New data on biostratigraphy of the Vendian Nemakit-Daldynian stage in the southern Siberian platform. Stratigr. Geol. Correl. 18, 492–504 (2010). https://doi.org/10.1134/S0869593810050035

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Key words

  • Vendian
  • Cambrian
  • Nemakit-Daldynian Stage
  • Siberian Platform
  • biostratigraphy
  • correlation