Stratigraphic distribution of brachiopods in the Artinskian Stage of the western slope of the Middle Urals
Abstract
The distribution of brachiopods in the sediments of the Artinskian Stage of the Urals has been repeatedly considered in the literature by F. N. Chernyshev [1889, 1902], G. N. Fredericks [1918], B. V. Miloradovich [1949], and D. L. Stepanov [1939, 1951]. However, all researchers did not divide the Artinskian Stage into horizons based on brachiopods, although the abundance and diversity of Artinskian brachiopods have long suggested the possibility of using them to distinguish two subarcs and even local horizons of the Artinskian Stage [Stepanov, 1939, Miloradovich, 1949, 1951]. In addition, a controversial stratigraphic position is occupied by the so-called Sylven reefs, which M. V. Kulikov [1948], V. D. Nalivkin [1949] and D. L. Stepanov [1951] attributed to the uppermost part of the Artinskian Stage, bordering the Kungur; B. V. Miloradovich [1949] defined their age as the Kungurian.
References
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