Dengizkul-Neog Fm
Type Locality and Naming
Along Lake Dengizkul on the Dengizkul Plateau, Southwest Kyzylkum. S.I. Ilyin, 1937 (171, p. 326-327).
Synonym:
Lithology and Thickness
Alluvial yellow-brown feldspar-quartz sands and sandstones with subordinate layers of clays and siltstone (aleurolites). In depressions, the lower, less powerful part of the section is composed mainly of lacustrine brownish-gray layered clays and siltstone (aleurolites). The formation is crowned by a horizon of concretionary sandstones, representing a carbonate weathering crust. Thickness up to 500 m.
Relationships and Distribution
Lower contact
Lies on the Agitmin Fm and all older deposits, up to the Cretaceous
Upper contact
With erosion overlain by the Sayat Fm.
Regional extent
Southwest Kyzylkum, South Pre-Aral. In the South Pre-Aral, the lower lacustrine aleurolite-clayey part of the section of the suite corresponds to the lower Akchagyl Kushkanatau suite, overlain with erosion by typically Dengizkul yellow-brown sands and sandstones. In the Pre-Aral, the Kushkanatau and Dengizkul suites are deeply embedded with lake-sea deposits of the upper Akchagyl Zair suite, which allows the Dengizkul suite to be conditionally referred to the n.-sr. Akchagyl (58; 166; 346). On the left bank of the Amu Darya in the Karakum, the same yellow-brown sands and sandstones are distinguished under the name Zaunguz suite.
GeoJSON
Fossils
Contains ostracods - Cyprideis littoralis Br., Potomocypris reflexa Schn., Condoniella albicans (Br.), Limnocythere quadrata Mand., Darwinula schneiderae Suzin. In it, Akchagyl gastropods were found - Clessiniola sp., Micromelania sp., Caspia sp., Clessiniola cf. polejaevi Andrus., Caspia matura Bog.
Age
Depositional setting
Additional Information