By the early 1980s, a monographic description of the main groups of organic remains from the Chergak series of Tuva had been largely completed and published: stromatoporates, tabulates, rugosas, bryozoans, crinoids.
Carbonate rocks of the Silurian of Tuva are of exclusively organogenic origin. In Central Tuva they form a significant part of the Silurian strata, are the most diverse in structure and origin.
The Tuva transgressive-regressive sedimentary complex combines the Shemushdag, Chergak and Khondergean series, connected by gradual transitions ...
Our country is rightly proud of remarkable scientists-geologists, but even among them there are few such as Dmitry V. Nalivkin - an outstanding pupil and successor of academicians A.P.Karpinsky, F.N.Chernyshev, A.A.Borisyak. Scientific and pedagogical activity of D.V.Nalivkin with unflagging energy continues for about seventy years ...
In geological studies of Tuva and adjacent areas use the stratigraphic scheme adopted by the Second Meeting on the development of stratigraphic schemes of Central Siberia in 1964 and approved by the Interdepartmental Stratigraphic Committee of the USSR. According to this scheme, the Silurian of Tuva is represented by two horizons: the lower - Chergakian and the upper - Khondergean ...
Of all the organic remains found in the sediments of the Chergakian suprahorizon, brachiopod remains are the most numerous. Nuclei, shell impressions, scattered flaps are found throughout the whole section of the Chergak series (from its base to the roof) and in a wide variety of rocks (from coarse-grained sandstones to shale and massive limestones). Finds of whole brachiopod shells are much rarer, but in some places they form massive assemblages. The brachiopod complex is represented almost exclusively by endemic forms ...
Upper Ordovician and Lower Silurian sediments are widespread in the Altai-Sayan folded region. They have been studied to varying degrees, paleontologically characterized differently, and have different relationships with each other.
In the extreme southwest of Tuva, the Silurian sediments are composed of small isolated mulds. The largest of these is the Mugur syncline, and two other small folds are located in the area of the Ordovician Kargin syncline...
On August 9, 1968, the Leningrad Mining Institute suffered a heavy loss: Vitaly I. Bodylevsky, Professor of the Department of Historical Geology, passed away. Vitaly Ivanovich gave fifty years of his life to the Mining Institute and during these long years trained and educated many hundreds of geologists, became a leading specialist in the field of paleontology and stratigraphy of the Mesozoic, a scientist of world renown.
Ordovician and Silurian sediments are quite widespread in the Altai-Sayan region. In describing the stratigraphy, tectonics, and history of geologic development of southern Siberia, many researchers have touched upon the paleogeography of certain areas in the Ordovician and Silurian. A. B. Ginzinger [1964] considered the paleogeography of Altai and Salair in the Ordovician in the most detail. M. S. Potapova gave the first detailed paleogeographic constructions for the Silurian of Altai. I. N. Kazakov [1965] and L. P. Zonenshain [1963] considered the geologic history of the Western Sayan in the Ordovician and Silurian periods
All researchers note the wide distribution of Ordovician sediments in the area of the Western Sayan, although the volume and structure of sediments attributed to the Ordovician are understood in different ways. In spite of sufficient geological study of the territory, the number of locations of remains of reliable Ordovician fauna is still measured here in units. One of these localities is the Karyn-Sug river. Karyn-Sug (according to I. B. Filippova) is located in the central part of the Western Sayan, the other two - the Manchurek River, the upper Manchurek River, and the upper Manchurek River. Manchurek River and the headwaters of the Ak-Sug River are located on its south-western edge, within Tuva. Locations of Ordovician fauna are also described on the northern and northeastern margins of Tuva - in the area of its interface with the Western Sayan ...
Фаунистически охарактеризованные ордовикские отложения известны на северо-востоке Тувы (систигхемская свита) и по северной окраине Тувинской котловины, в бассейне р. Уюк (малиновская свита). В последние годы нашими работами было доказано широкое развитие ордовикских отложений (шемушдагская свита) в Западной Туве. Ранее эти толщи относились к силуру и считались ландоверскими.
