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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Qaratau Deposits Formation

Qaratau Deposits Fm

Period:

Carboniferous

Age Interval:

Serpukhovian-Bashkirian (C_1-2), S5

Province:
North Tajik

Type Locality and Naming

Synonym: Namurian - Moscow Deposits

Reference section:

Lithology and Thickness

In the Qaratau mountains, the considered deposits in the lower part are represented by dark limestones, in the middle part - by interbedding of clay slates, limestones and sandstones, and in the upper part - by thinly bedded limestones. Their total thickness is about 1000 m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

They lie conformably on the Visean - Serpukhovian limestones (Karatau Limestone Fm).

Upper contact

Overlain transgressively by the Moscow stage limestone-terrigenous rocks.

Regional extent

They are distinguished in the northern part of the Turkestan region: in the southeast part of the Qaratau mountains.

GeoJSON

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Fossils

The considered deposits contain remains of Namurian(Serpukhovian) Goniatites Homoceratoides cf. divaricatum (Hind.), Cravenoceras sp., Homoceras sp.; Namurian foraminifera Eostaffella ex gr. pseudostruvei var. angusta Kir., Archaediscus pauxillus Schlyk.

Age

Based on these determinations, the age of the rocks can be considered Namurian. However, in areas to the east (the low northern foothills of the Turkestan and Alay Ranges), in the cap of analogous deposits, remains of Bashkirian age fauna have been found. Therefore, it seems more correct to consider the age of the described rocks as Namurian (Serpukhovian)-Bashkirian. This is not contradicted by the previously mentioned transgressive cover with limestones-terrigenous sediments containing remains of Moscow fauna.

Age Span:

Beginning stage:

Serpukhovian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

326.87

Ending stage:

Bashkirian

Fraction up in the ending stage:

1.0

Ending date (Ma):

315.15

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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