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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Karatau Formation

Karatau Fm

Period:

Triassic

Age Interval:

Induan-Anisian (T_1-2), M3b, M3c

Province:
SE Tajik (SE Pamir)

Type Locality and Naming

Includes in SE Murghab district (Gurdumdin type section Kastanatdjilga, Buryukurmes rivers), SE Murghab district Gurdumdin type (Shin and Igrymiyu rivers). They are widespread in the Southeast Pamir, in the Triassic sections of the central type (Dronov, Leven, 1961). The suite was identified in 1968 by V. I. Dronov.

Synonym: Karatau suite, Караташская свита

Reference section:

Lithology and Thickness

It consists of dark and light gray, occasionally dirty reddish, thin-bedded slate-like limestones, marls, calcareous shales, and dolomites. The thickness of the suite is 50-140 m.

Lithology Pattern:

Dolomitic limestone

Relationships and Distribution

Lower contact

It lies without angular discordances, but with erosion on the upper Permian

Upper contact

It is overlain by the Ladinian-Norian Aktash Fm.

Regional extent

It is widespread in the Southeast Pamir.

GeoJSON

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Fossils

In the basin of the Shindy River, in the lower part of the suite, beds and packets of limestone conglomerates are noted in the section. In the middle and upper parts of the suite in the basins of the rivers Karakulasha, Khanyuly, and others, remains of Anisian ammonites have been found of Monoids Danubites cf. floriani Mojs., Leiophyllites sp.; brachiopods Rhynchonella cf. attilina Bitt., Mentzelia cf. mentzeli Dunk., M. koeveskalliensis Boeckh, Hirsutella cf. hirsuta Alberti.

Age

The Induan and Olenekian stages are assumed in the faunistically uncharacterized lower part of the formation. Schematic stratigraphic column indicates the Aktash Fm and Karatau Fm has conformable contacts, hence considered Anisian as the top.

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.