A new findings of vendian macrofossils in the upper precambrian of chetlasskiy kamen hill of the timan range (arkhangelsk region)

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Abstract

Macrofossils as composite molds and casts of Vendian soft-bodied organisms were found in the Vizinga and Ust’-Palega formations on the Chetlasskiy Kamen Hill of the Central Timan Range for the first time. Among them, representatives of palaeopascichnids, aspidellamorphs, possible frondomorphs, arumberiamorph microbially-induced sedimentary structures, and trace fossils were identified. Previously we have reported Vendian macrofossils from the Upper Precambrian of the South Timan Range in Dzhezhim-Parma Hill. Thus, the discovery of another fossil locality in the central part of the Timan Range significantly expands their palaeogeography and also clarifies the age limits of the deposition of the Vizinga and Ust-Palega formations, the stratigraphic position of which in the Upper Precambrian section was controversial.

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About the authors

A. V. Kolesnikov

Geological Institute, Russian Academy of Sciences

Author for correspondence.
Email: kolesnikov@ginras.ru
Russian Federation, Moscow

V. N. Pan’kov

Geological Institute, Russian Academy of Sciences

Email: kolesnikov@ginras.ru
Russian Federation, Moscow

V. A. Pan’kova

Geological Institute, Russian Academy of Sciences

Email: kolesnikov@ginras.ru
Rwanda, Moscow

I. V. Latysheva

Geological Institute, Russian Academy of Sciences

Email: kolesnikov@ginras.ru
Russian Federation, Moscow

A. V. Shatsillo

Geological Institute, Russian Academy of Sciences; Schmidt Institute of Physics of the Earth, Russian Academy of Sciences

Email: kolesnikov@ginras.ru

Corresponding Member of the RAS

Russian Federation, Moscow, Moscow

N. B. Kuznetsov

Geological Institute, Russian Academy of Sciences

Email: kolesnikov@ginras.ru
Russian Federation, Moscow

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2. Fig. 1. a, b – scheme of location of new locality of remains of Vendian soft-bodied organisms in the north-eastern frame of the East European Platform; c – summary section of the Upper Precambrian of the Middle and Southern Timan. 1 – location of localities of remains of Vendian soft-bodied organisms on the Timan Ridge on the Chetlas and Mezenskaya Pizhma rivers; 2 – position of remains on the summary section; 3 – dolomites; 4 – limestones; 5 – sandstones and gravelites; 6 – grey-colored sandstones; 7 – light quartz sandstones; 8 – grey-colored quartz sandstones; 9 – red-colored quartz sandstones.

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3. Fig. 2. Representatives of Vendian soft-bodied organisms from the Upper Precambrian of the Middle Timan: a – sample no. CT23/1–1, Ust’-Paleg Formation, Palaeopascichnus linearis (yellow arrows); b – sample no. CT23/8–2, Vizinga Formation, P. linearis (yellow arrows); c – sample no. CT23/8–1, Vizinga Formation, P. linearis (yellow arrows); g – sample no. CT23/8–5, Vizinga Formation, P. delicatus (red arrows); d – sample no. CT23/13-P13, Ust’-Palega Formation, Helminthoidichnites isp.; e – sample. No. CT23/9–2, Vizinga Formation, putative remains of a frondomorphic organism; g, h – Samples No. CT23/8–13, CT23/5–10, Vizinga Formation, attachment organs of Aspidella sp. (green arrows); i – Sample No. CT 23/3–3, Vizinga Formation, microbially induced sedimentary texture of the Arumberia banksi type.

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