THE LOWER DEVONIAN PRIDOROZHNAYA FORMATION: GENERAL DESCRIPTION AND STRATOTYPE SECTION (SHIRINSKY REGION, REPUBLIC OF KHAKASSIA)

N. A. Makarenko, A. D. Kotelnikov, I. V. Kotelnikova

Tomsk State University, Tomsk, Russia

New data have been acquired on the structure and layer-by-layer lithological composition of the Pridorozhnaya Formation of the Shirinsko-Marchengashsky site in North Khakassia. This stratigraphic unit was characterised in terms of paleonthology based on the available propteridophyte (Ryniophyte) flora list, as well as new findings of stromatolites and osteostracans. The Lower Devonian substantially terrigenous deposits of two adjacent sites – Shirinsko-Marchengashsky and Matarak-Shunetsky – were correlated based on bio- and lithostratigraphic data. The authors supposed different geodynamic environments of formation of the two sections being compared. The explored stratigraphic unit corresponds to the requirements of the Stratigraphic Code of Russia for valid stratigraphic units, which gives reason for ranking the Pridorozhnaya series as formation with the name remaining the same.

Key words: Khakassia, Lower Devonian, Pridorozhnaya Formation, markers, stratotype section, propteridophyte (Ryniophyte) flora, correlation of sections.

DOI 10.20403/2078-0575-2017-2-3-12

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