Ostracods of the Silurian-Devonian boundary deposits of the Malguzar Mountains (Central Asia)
Abstract
In the eastern part of the Malguzar Mountains (northwestern spur of the Turkestan Ridge, the basin of the upper Zaamin-su River), the Silurian-Devonian boundary deposits occupy a significant area. They compose the wings of the latitudinal synclinal structure and are represented by very diverse terrigenous-carbonate rocks. The most complete section of them is known on the northern wing of the structure near the village of Myk in the upper part of the river. Myk in the upper reaches of the Yettkichu River, the left component of the Zaaminsu River. Zaaminsu River. Here, an alternation of organogenic and slam limestones, limestone conglomerates, clay shales, siltstones with lenses of sandstones, conglomerates and gravelites is exposed. The sediments contain abundant organic remains: stromatopores, corals, brachiopods, bryozoans, gastropods, pelecypods, nautiloids, and ostracods. Upper Silurian and Devonian sediments in this area were studied by V. D. Chekhovich [1965], A. I. Kim, and N. M. Larin (1960-1962). The author became acquainted with these sediments in the summer of 1968. The collected material is the basis of this article.
References
- Abushik A. F. Ludlovian ostracodes of the Turkestan Range (Central Asia). Paleontol. Journ., No. 3, 1968a.
- Abushik A. F. Ostracods of the Borshchov horizon. In the book: Biostratigraphy of Boundary Deposits of the Silurian and Devonian. Nauka, 19686.
- Egorov V.G. Ostracods of the Franksian Stage of the Russian Platform. Gostoptekhizdat, 1950.
- Kim A. I. Biostratigraphy and tabulates of the Silurian and boundary deposits of the Southern Tien Shan. Cand. dissertation, Novosib. university, 1970.
- Netskaya A. I. Ostracods of the Ordovician and Silurian of the USSR. Proc. VNIGRI, new series, vol. 251, 1966.
- Polenova E. N. Ostracods of the Lower Devonian of Salair. Nauka, 1968.
- Chekhovich V. D. and Porshnyakov G. S. Turkestan-Alai Zone. In the book: Silurian system. Nedra, 1965.
- Adatnczak F. Stockholms Contribs. Geol., vol. XV, No. 2, 1966.