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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Shirk Formation

Shirk Fm

Period:

Cretaceous

Age Interval:

Berriasian? Valanginian? K1, D1, S3, C2, C2a

Province:
SW Tajik, North Tajik, Central W Tajik

Type Locality and Naming

Includes in Khation Region, Darvaz district, 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.

Synonym: Shirkskaya suite, upper Karabil horizon, lower Almurad horizon

Lithology and Thickness

In the Dushanbe district, the lower part of the Shirk Fm is represented by red gravel conglomerates with a thickness of 10-100, and the upper part is represented by red sand-gravel-gravel rocks with a thickness of up to 100 m.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

Overlies the Karabil Fm

Upper contact

Overlain by the Almurad Fm

Regional extent

Afghan-Tajik Basin. The Shirk Fm is developed in the Dushanbe district.

GeoJSON

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Fossils

No organic remains have not been found.

Age

Lower Valanginian?

Age Span:

Beginning stage:

Valanginian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

137.70

Ending stage:

Valanginian

Fraction up in the ending stage:

0.5

Ending date (Ma):

135.15

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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