New Data on Conodonts of the Upper Devonian of the Polar Urals (Ostantsovy Section, Malaya Usa River)

M.A. Soboleva*, D.B. Sobolev**

Institute of Geology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, 167982 Russia

E-mail: *matusha.888@mail.ru, **dbsobolev@rambler.ru

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Abstract

The main features of the Upper Devonian sediments on the right side of the Ostantsovy Creek (the left tributary of the Malaya Usa River) in the eastern part of the Bielsko-Eletskaya structural formational belt on the western slope of the Polar Urals have been considered. The late Frasnian age of these sediments has been determined on the basis of conodonts (the linguiformis zone of the standard conodont scale). The transition from clastic and organic limestones with massive stromatoporoid forms to limestones with fused (reservoir) stromatoporoid forms and Palmatolepis biofacies is indicative of the transgressive shift of the linguiformis phase. This transgressive level is an indirect expression of the Upper Kellwasser global event.

Keywords: conodonts, lithology, stratigraphy, Upper Devonian, Frasnian, Polar Urals

Acknowledgments. We are grateful to E.V. Antropova for identification of stromatoporoids and S.S. Shevchuk for SEM survey (Institute of Geology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar).

The study was supported by the Russian Foundation for Basic Research (project no. 16-35-00049) and the Ural Branch of the Russian Academy of Sciences (project no. 15-18-5-37).

Figure Captions

Fig. 1. A fragment of the geological map (by [1]) with the location of the studied Ostantsovy section (A) and the scheme showing the bedrock exposures of the Upper Devonian sediments on the Ostantsovy Creek (B).

Fig. 2. The stratigraphic column with the distribution of conodonts.

Fig. 3. The general view of the Ostantsovy section (A), the relict structure of massive stromatoporoids in the polished section of sample 5 (B), the relict structure of tubular stromatoporoids in the polished section of sample 6 (C, D).

Fig. 4. Fig. 1-2. Palmatolepis ederi Ziegler et Sandberg, 1990, (1) ind. no. 492/10-66, sample 24; (2) ind. no. 492/10-59, sample 23. Fig. 3. Palmatolepis linguiformis Muller, 1956, ind. no. 492/10-61, sample 24. Fig. 4. Palmatolepis rhenana nasuta Müller, 1956, ind. no. 492/10-54, sample 22. Fig. 5-8. Palmatolepis rhenana rhenana Bischoff, 1956, (5) ind. no. 492/10-55, sample 22; (6) ind. no. 492/10-80, sample 24; (7) ind. no. 492/10-65, sample 24; (8) ind. no. 492/10-57, sample 22. Fig. 9. Palmatolepis cf. gigas extensa Ziegler et Sandberg, 1990, ind. no. 492/10-70, sample 24. Fig. 10-11. Palmatolepis gigas extensa Ziegler et Sandberg, 1990, (10) ind. no. 492/10-63, (11) ind. no. 492/10-73, sample 24. Fig. 12. Palmatolepis gigas gigas Muller et Youngquist, 1947, ind. no. 492/10-67, sample 24. Fig. 13. Palmatolepis jamieae Ziegler et Sandberg, 1990, ind. no. 492/10-69, sample 24. Fig. 14, 16, 17. Palmatolepis aff. subrecta Muller et Youngquist, 1947, (14) ind. no. 492/10-77, sample 24; (16) ind. no. 492/10-60, sample 23; (17) ind. no. 492/10-79, sample 24. Fig. 15. Palmatolepis sp., ind. no. 492/10-71, ind. 24. Fig. 18. Polygnathus evidens Klapper et Lane, 1985, ind. no. 492/10-72, sample 24. Fig. 19. Polygnathus aspelundi Savage et Funai, 1980, ind. no. 492/10-76, sample 24. Fig. 20. Polygnathus lodinensis Polsler, 1969, ind. no. 492/10-78, sample 24. Fig. 21. Icriodus alternatus alternatus Branson et Mehl, 1934, ind. no. 492/10-74, sample 24.

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For citation: Soboleva M.A., Sobolev D.B. New data on conodonts of the Upper Devonian of the Polar Urals (Ostantsovy section, Malaya Usa River). Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2016, vol. 158, no. 3, pp. 455–467. (In Russian)


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