Sorbulak Fm
Type Locality and Naming
A. Kh. Kafarsky and I. V. Pyzyanov (1963)
Synonym: Sorbulak suite (сарынамакской свите)
Reference section:
Lithology and Thickness
They are composed of interbedded siltstones, clays, and sandstones of brown and reddish-magenta colors, which contain at the base and top layers and lenses of dirty-green and white gypsum and clays. Occasionally, there are lenses of rock salt of 5-10 m thickness and dirty-gray or black cryptocrystalline gypsumy limestones. Bedrock layers of 15 - 30 cm in thickness. The rock power is 350 - 550 m.
A. Kh. Kafarsky and I. V. Pyzyanov (1963) established the similarity of the Sorbulak Fm section to the Jurassic sections of Southwestern Darvaz and proposed to distinguish instead of the Sorbulak Fm three suites - Zuryuzamin, Deikaliy, and Surkhob (Западного Дарваза и предложили выделить вместо сорбулакской свиты) (analogous to the Sarynamak Fm).
Supporting this assumption mainly, V. S. Luchnikov considers it necessary to note the following. To the Upper Triassic formations of the Zuryuzamin Fm (зюрюзаминской свиты), one should attribute the volcanic mass lying below the weathering crust; carbon-bearing sedimentary deposits, lying above the weathering crust, should be combined into the Lower, Middle Jurassic Gring Fm (грингскую свиту), placing above all the suites that are distinguished in Southwestern Darvaz (Luchnikov, 1973).
Relationships and Distribution
Lower contact
They are conformably deposited on the Zarbuz Fm (зарбузской свите)
Upper contact
They are conformably overlain by red sandstones and clays, which are tentatively attributed to the Lower Cretaceous.
Regional extent
In the Zaalaisky district, following A. Kh. Kafarsky and I. V. Pyzyanov (1963), the deposits previously included in the upper part of the Sorbulak Fm (сарынамакской свите) are referred to the Sarynamak Fm (сорбулакской свиты).
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Age
Depositional setting
Additional Information