Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Main source = Baratov, R.B., et al. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Publishing House "Donish", Dushanbe, 269 pp. plus tables. Provided by Dr. Jovid Aminov, Nazarbayev University, Astana, Kazakhstan Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

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Aksuy Formation

Aksuy Fm

Period:

Cretaceous

Age Interval:

Middle Aptian (K₁¹), K1, D1, S3, C1, C1a-c, C2, C2a

Province:
SW Tajik, North Tajik, Central W Tajik

Type Locality and Naming

Includes in Khation Region, Darvaz District, Hisar-Zarafshan ranges, Dushanbe - west Shirkent-Luchob, Dushanbe - east Shirkent-Luchob

The Berriasian? stage - middle substage of the Aptian stage is identified in the South Gissar, Dushan, Binsky, Kafirnigan, Vakhsh, Zaalaysky, and Darvaz districts includes the following horizons: 1-Karabil (Berriasian? Valanginian?); 2-Almurad (Valanginian-lower? Hauterivian); 3-Kyzyltash (upper? Hauterivian-lower? Barremian); 4-Okozbulak (upper Barremian-lower Aptian); 5-Kaligrek (middle Aptian). The Karabil horizon includes the Karabil Fm and the lower part of the Shirk Fm. The Almurad horizon includes the upper part of the Shirk Fm, the Almurad Fm, and the Vakhsh Fm. The Kyzyltash horizon is represented by the Kyzyltash Fm. The Ouzbulazh horizon includes the Ouzbulazh Fm and the lower part of the Obigarm Fm. The Kaligrek horizon is represented by the upper part of the Obigarm suite and the Aksuy Fm. The typical suite of the Kaligremsky horizon - the Kaligrekskaya - is composed exclusively of marine rocks: limestones, sandstones, and clays. It is widespread beyond the borders of the Tajik SSR.

Synonym: Aksuy suite, Kaligremsky horizon, Kалиrркский горизонт, Aksuyskaya suite, Аксуйская Свита

Lithology and Thickness

The Aksuy Fm is composed of massive gray deltaic sandstones with packets of red-colored sandstone-clayey rocks in its lower and upper parts. The thickness is 40 - 130 m.

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

Overlies the Obigarm Fm.

Upper contact

Overlain after local erosion gap by the Karakuz Fm.

Regional extent

Afghan-Tajik Basin. It is in the southern parts of the Kafirnigan and Vakhsh districts, as well as in the Darvaz district.

GeoJSON

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Fossils

Typical for the suite are freshwater ostracods Cypridea gissarensis Andrv.

Age

Middle Aptian

Age Span:

Beginning stage:

Aptian

Fraction up in beginning stage:

0.4

Beginning date (Ma):

118.12

Ending stage:

Aptian

Fraction up in the ending stage:

0.75

Ending date (Ma):

115.25

Depositional setting

Freshwater environment

Depositional pattern:

Additional Information

Compiler:

Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Dushanbe, 276.