Stratigraphy and Geological Correlation

, Volume 26, Issue 6, pp 599–610 | Cite as

New Data on Biostratigraphy of the Middle Cambrian Section at the Khorbusuonka River, Northeastern Siberian Platform

  • I. V. KorovnikovEmail author
  • D. A. Tokarev


The aggregated section of Middle Cambrian at the Khorbusuonka River, northeastern Siberian Platform, is described. The aggregated sequence is compiled on the basis of investigations at four bank outcrops. The findings of trilobites at different stratigraphic levels allowed us to identify the intervals comparable to regional zones of the Amgan and Mayan stages (Middle Cambrian). New findings and analysis of stratigraphic distribution of trilobites helped to specify the position of the Middle Cambrian lower boundary. The lower boundary of the Mayan Stage is drawn by the first appearance of Corynexochus perforatus in the section, 9 m from the base of the Yunkyulyabit–Yuryakh Formation. Trilobites of Cyclolorenzella sp. and Kuraspis sp. found in the upper Tyussala Formation are characteristic of the boundary layers of the Middle and Upper Cambrian. It was supposed earlier that the Upper Cambrian part of the sequence began in the overlying Lapar Formation; however, the aforementioned findings suggest that the Middle Cambrian lower boundary can be located within the limits of the upper Tyussala Formation.


stratigraphy Middle Cambrian trilobites Siberian Platform Khorbusuonka River 



The work was implemented in the framework of the research project (part of the program titled “Ecosystem Reconstructions, Stratigraphy, and Paleobiology of the Proterozoic and Phanerozoic of Siberia and the Russian Arctic”) and integrated program of the Siberian Branch, Russian Academy of Sciences. The work was supported by the Ministry of Education and Science of the Russian Federation (grant no. 14.Z50.31.0017).

Reviewers A.Yu. Zhuravlev and V.N. Sergeev


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© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  1. 1.Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of SciencesNovosibirskRussia
  2. 2.Novosibirsk State UniversityNovosibirskRussia
  3. 3.Schmidt Institute of Physics of the Earth, Russian Academy of SciencesMoscowRussia

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