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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Karabil Formation

Karabil 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: Karabil suite, Karabil horizon

Lithology and Thickness

Composed of red rocks: claystones and sandstones (in the upper). Thickness 40 - 250 m.

Karabil Horizon (Карабильский горизонт) includes the lower part of the Shirk Fm and the Karabil Fm.

The Shirk Fm, the first of them (Shvanov, 1961) is developed in the Dushanbe district, represented by red gravel conglomerates with a thickness of 10-100 m.

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

Upper Jurassic rocks (Varzob Fm of Oxfordian-Kimmeridgian into Tithonian?) or various Paleozoic formations

Upper contact

Overlain by the Shirk Fm

Regional extent

Afghan-Tajik Basin. The Karabil Fm is widespread in districts South Gissar, Dushan, Kafirnigan, Vakhsh, Zaalaysky and Darvaz.

GeoJSON

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Fossils

No organic remains have not been found.

Age

Berriasian? Valanginian?

Age Span:

Beginning stage:

Berriasian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

143.10

Ending stage:

Berriasian

Fraction up in the ending stage:

1.0

Ending date (Ma):

137.70

Depositional setting

Depositional pattern:

Additional Information

* The Karabilsky horizon [hence Karabil Fm], according to the resolutions of the MSC, is Upper Jurassic. However, in Tajikistan, during geological surveys, it was not separately distinguished and was mapped together with younger Cretaceous formations. Its thickness constitutes a small part of the thickness of the definitely Lower Cretaceous rocks. Therefore, in this work (Baratov et al., 1976), the Karabilsky horizon is conditionally considered as part of the Lower Cretaceous strata thickness. It should be noted that the views on the Late Jurassic age of the typical sequence of this horizon are extremely controversial.

Compiler:

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