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Local Bryozoan biostratigraphic zones of the Eifelian stage (Middle Devonian) of the western Altai-Sayan Folded Area

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Abstract

Bryozoan assemblages from the lower part of the Middle Devonian of the western Altai-Sayan Folded Area are studied because of the recent discovery of Eifelian ammonoids (Cabrieroceras crispiforme Zone) in the Safonovo Formation, which had been previously dated as Givetian. The bryozoan collection (21 species) was sampled from six sections of the Mamontovo Regional Substage (“Horizon”) of the Eifelian Stage, seven sections of the Safonovo formation of Salair, and one section of the upper part of the Melnichnaya Formation of Rudnyi Altai. Two groups of bryozoans with different species composition are recognized, one of which occurs in the Malaya Salairka Beds of the Mamontovo Horizon, whereas the other occurs in the Safonovo Formation immediately below the Cabrieroceras crispiforme Zone. Two local biostratigraphic zones are recognized on the basis of these groups (Eridotrypella distributa and Leptotrypa spinosa zones), characterizing the lower and upper parts of the Eifelian Stage of the western Altai-Sayan Folded Area.

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Authors and Affiliations

  1. Siberian State Industrial University, ul. Kirova 42, Novokuznetsk, 654007, Russia

    O. P. Mesentseva

  2. Kuzbass State Pedagogical Academy, pr. Pionerskii 13, Novokuznetsk, 654027, Russia

    Yu. V. Udodov

  3. National Research Tomsk Polytechnic University, pr. Lenina 30, Tomsk, 634050, Russia

    N. V. Gumerova

Authors
  1. O. P. Mesentseva
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  2. Yu. V. Udodov
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  3. N. V. Gumerova
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Correspondence to O. P. Mesentseva.

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Original Russian Text © O.P. Mesentseva, Yu.V. Udodov, N.V. Gumerova, 2014, published in Stratigrafiya. Geologicheskaya Korrelyatsiya, 2014, Vol. 22, No. 4, pp. 29–35.

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Mesentseva, O.P., Udodov, Y.V. & Gumerova, N.V. Local Bryozoan biostratigraphic zones of the Eifelian stage (Middle Devonian) of the western Altai-Sayan Folded Area. Stratigr. Geol. Correl. 22, 370–376 (2014). https://doi.org/10.1134/S0869593814040078

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  • DOI: https://doi.org/10.1134/S0869593814040078

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