Ostracods of the Silurian-Devonian boundary deposits of the Malguzar Mountains (Central Asia)
Abstract
In the eastern part of the Malguzar Mountains (a northwestern spur of the Turkestan Range, in the upper Zaamin-su River basin), the transitional Silurian and Devonian strata cover a significant area. They form the flanks of a latitudinal synclinal structure and consist of terrigenous-carbonate rocks that are highly varied in composition. The most complete section of these deposits is found on the northern flank of the structure near the village of Myk in the upper reaches of the river. The village of Myk is located in the upper reaches of the Yetkichu River, a left tributary of the Zaaminsu River. The Zaaminsu River. Here, an alternation of organogenic and sedimentary limestones, limestone conglomerates, clay shales, and siltstones with lenses of sandstones, conglomerates, and gravelites is exposed. The sediments contain abundant organic remains: stromatopores, corals, brachiopods, bryozoans, gastropods, bivalves, nautiloids, and ostracods. The Upper Silurian and Devonian deposits in this area were studied by V. D. Chekhovich [1965], A. I. Kim, and N. M. Larin (1960–1962). The author examined these deposits in the summer of 1968. The data collected form the basis of this article.
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References
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