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- W1543155208 abstract "Characteristic of the Ul’yanov-Saratov depression are the increase d thickness of the terrestrial Devonian (550-750 m) and of th e carbonate deposits of the Devonian and Carboniferous (up to 2000 m), almost a complete lack of halogen deposits and the vari-colored rocks of the Per mian and Triassic periods, and an increased thickness of the remaining deposits of the terrestrial unit of the Mesozoic and Paleogene (up to 800 m). In the Zhigulevsk-Pugachev swell are considerably reduced thickne sses of the Devonian terrestrial unit (up to 150 m) and of the carbonate unit (up to 1500 m). Here too the section of the terrest rial member of the Carboniferous is reduced, the hydrochemical stratum and the vari -colored unit are almost entirely absent, and the terrestrial rocks of the Mesozoic and Paleogene periods are incompletely represented and possess negligible thickness (up to 200 m). On the anticline are several widely developed rocks of the newest covering deposits, the thickness of which reaches 150 m. The Buzuluk depression is characterized by an increase of the th icknesses of the Devonian terrestrial unit, and by an increased thickness of the carbonate unit up to 2500 m and more; these contain rooks enriched with su lphates on to the development of thick strata of anhydrites in the Serpukhov substage in Buzuluk. Also characteristic of the section of the depression is the appearance of thick (especially on the south of the depres sion) deposits of a Permian hydrochemical unit (up to 1500-1750 m) and of a vericolored unit (up to 500 m), as well as some increase of the thicknesses of Mesozoic terrestrial rocks (up to 300 m) and an increased thickness of the newest cover deposits (up to 400 m), filling the anci ent erosional valleys of t he paleo-rivers Volga and Kamelik. The presence of thick terrestrial deposits of the Lower Carbonif erous and, possibly, the Upper Devonian, the thickness of which amounts to almost 500 m, in the Mukhanov region, is a specific feature of the section of the axial part of the Buzuluk depression. A narrow strip of increased thicknesses of this unit along the axis of the depression extends to the south toward the salt dome region. The Pilyugino-Sorochinsk projection is disti nguished by a certain reduction in the thicknesses of the carbonate unit, an almost complete absence in the section of terrestrial units as well as a cer tain reduction in the thickn esses of the Mesozoic rocks and the newest covering de posits. In the Caspian salt dome region are sharply increased thicknesses of the hydrochemical unit, of the vericolored and all other s eries of the Mesozoic and Paleogene terrestrial unit, as well as of the newest covering deposits. In the northern part of the region are the thickest acc umulations of the latter (up to 500-600 m), which occur in the large erosional pre-Akchagyl valleys of the Volga and Ural rivers." @default.
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- W1543155208 date "1959-01-01" @default.
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- W1543155208 title "The Tectonics and Oil and Gas Possibilities of the Northern Part of the Territory of North Caspian Depression" @default.
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