Stratigraphy and lithology
Section editor – PhD in geology and mineralogy Kirichkova A.I.
Article # 25_2019 submitted on 06/18/2019 displayed on website on 08/02/2019
27 p.
pdf Conodonts of the Devonian-Carboniferous boundary deposits of the Kozhim River key section (Subpolar Urals)
A new version of conodont biostratigraphy (based on compilation of new author’s and published materials) of Tournaisian part of the Kozhim River key section is given. The zones/subzones expansa, sulcata, Lower duplicata, Upper duplicata-sandbergi, quadruplicata and isosticha are characterized. The bases of all zonal subdivisions except for sulcata and duplicata Zones are shifted (compared to the latest versions of zonal biostratigraphy). The most reliably diagnosed zones (the base of the sulcata, duplicata, and quadruplicata Zones) are established in carbonate graded cycles (calciturbidites). The deposits of the terminal Famennian are very conditionally compared with the Lower and lower part of the Middle praesulcata Zones according to the position in the section. Absence of deposits of the upper part of the Middle and Upper praesulcata Zones suggests the presence of erosion on the D/C boundary interval. The presence of erosion on the D/C boundary interval doesn’t allow using the Kozhim River section as a key section of the stratigraphic boundary (in accordance with the tasks and rules of studying and describing the key stratigraphic sections developed by an interdepartmental stratigraphic committee). However, formally this section can be used as a key section of the structural-facial zone due to the fact that it is the most studied, and by the availability of outcrops, it exceeds all sections within the development of deep-shelf deposits of the Kozhim intra-shelf palaeodepression.

Keywords: conodonts, biostratigraphy, Famennian, Tournaisian, key section, Subpolar Urals.
article citation Plotitsyn A.N., Vevel Ya.A. Biostratigrafiya verkhnedevonsko-nizhnekamennougol'nykh otlozheniy opornogo razreza na r. Kozhim (Pripolyarnyy Ural) po konodontam [Conodonts of the Devonian-Carboniferous boundary deposits of the Kozhim River key section (Subpolar Urals)]. Neftegazovaya Geologiya. Teoriya I Praktika, 2019, vol. 14, no. 3, available at: http://www.ngtp.ru/rub/2019/25_2019.html
DOI https://doi.org/10.17353/2070-5379/25_2019
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