Kushkanatau Formation

Kushkanatau Fm

Period:

Neogene

Age Interval:

upper Pliocene-Lower Akchagyl regional stage, U1

Province:
Ustyurt-Sultanuzdag

Type Locality and Naming

Along the residual upland of Kuskhanatau, S. Aral Sea. A.I. Zhivotovskaya, V.G. Danilov, 1969 (199, pp.57-58). Stratotype - southwestern end of the Kuskhanatau elevation (346).

Synonym: Kushkanatau Suite, Кушканатауская св.

Lithology and Thickness

Lake-sea clays and marls, pinkish and greenish-gray, with pale siltstone (aleurolites) at the top, light yellow sands. Thickness up to 60m.

Lithology Pattern:

Continental marl

Relationships and Distribution

Lower contact

Overlies various Paleogene rocks.

Upper contact

With erosion, it is overlain by yellow-brown feldspar-quartz sands and sandstones, forming the upper part of the Dengizkul-Neog Fm.

Regional extent

Preserved on the erosional uplands of Kushkanatau and Beltau in the Southern Aral region. It is correlated with lacustrine clay-aleurolite (clayey siltstone) deposits forming the lower part of the Dengizkul-Neog Fm, with the Uchkolsay Fm and Tuzkan Fm. G.Yu.Alferov, V.G. Danilov (166)

GeoJSON

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Fossils

Contains clusters of small depressed gastropods Clessiniola sp., Micromelania sp.; ostracods - Limnocythere tenuireticulata Suzin., L. detruncata Suzin., L. quadrata Mand., Cyprinotus baturini Schn., Ilyocypris tuberculata (Br.), I. bradyi Sars., I. Gibba (Ramdohr.), Zonocypris memdranae Liv., Eucypris concinna Schn. and others.

Age

B.I.Pinhasov (346) attribute the suite to the Lower Akchagyl. lower Upper Pliocene = modern Piacenzian (Lower Akchagyl regional stage)

Age Span:

Beginning stage:

Piacenzian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

3.60

Ending stage:

Piacenzian

Fraction up in the ending stage:

1.0

Ending date (Ma):

2.58

Depositional setting

Depositional pattern:

Additional Information

Compiler:

B.I.Pinhasov – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”