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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Karatazh Formation

Karatazh Fm

Period:

Triassic

Age Interval:

Induan-Anisian (T_1-3), M2

Province:
SE Tajik (SE Pamir)

Type Locality and Naming

Includes in SE Murghab district (Istyk type Dunkeldyk area). It is distinguished by V. I. Dronov in 1968.

Synonym: Karatazhskaya suite, Караташская свита

Reference section:

Lithology and Thickness

(80 m) in the most complete sections has a three-member structure. The lower part of the suite (Bailtam member), with a thickness of 5-20 m, is composed of dark and podzolic gray, sometimes with a reddish tint, finely layered slaty sandy limestones and calcareous sandstones. The middle part of the suite (Taldykol member (талдыкольская толща), with a thickness of 20 m, is composed of variously pebbly, including boulders, limestone conglomerates and conglomerate breccias with beds and packets of finely layered slaty limestones, marls, and clay shales. The upper part of the suite (Zuogansky member (зоуганская толща)), with a thickness of 40 m, is composed of dark and light gray finely layered slaty limestones.

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

Bailtam member of the section is universally distinguished above the tuffaceous Upper Permian rocks (Takhtabulak Fm (тахтабулакской свиты).

Taldykol member lies unconformably on the previous member.

Upper contact

Bailtam member below the first horizon of limestone conglomerates of the overlying lower Triassic member.

Regional extent

It is widespread in the Southeast Pamir.

GeoJSON

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Fossils

Organic remains collected in the middle part of the Fm (Taldykol member) in the basins of the rivers Karasu and Karabeles are represented by Early Triassic pelecypods Eumorphotis multiformis (Bitt.), Velopecten albertii Goldf., Anadontophora fassaensis Wissm., Gervillia aff. acythica Krumb.; and ammonoids Flemengites sp.

No organic remains have been found in upper part of the suite (Zuogansky member).

Age

Based on the fossil data it is considered as Induan-Anisian

Age Span:

Beginning stage:

Induan

Fraction up in beginning stage:

0.0

Beginning date (Ma):

251.90

Ending stage:

Anisian

Fraction up in the ending stage:

1.0

Ending date (Ma):

241.46

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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