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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West Karadzhilgin Formation

West Karadzhilgin Fm

Period:

Carboniferous

Age Interval:

Visean – Moscovian (C1-2? zk), Ka1

Province:
NE corner Tajik

Type Locality and Naming

It was delineated in 1965 by Ye.F. Roman'ko, E.S. Chern'er, and I.V. Pyzyanov.

Synonym: West Karadzhil-Ginskaya suite, 3аnаднокараджил - rинскэя сnита

Reference section:

Lithology and Thickness

It consists of interleaved black argillaceous shales, organogenic limestones, claystones, and polymictic sandstones with lenses of conglomerates. Thickness 600-800 m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

The underlying deposits are unknown.

Upper contact

The suite is overlain with a concealed unconformity (R) by the rocks of the Lower Permian.

Regional extent

It is widespread in the Karakul district.

GeoJSON

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Fossils

In the limestones of the West Karadzhilgin Fm (западнокараджилгинской свиты), a Visean foraminiferal and rugose complex was found: Archaediscus krestovnikovi Raus., Mediocris mediocris (Viss.), Eostafiella ikensis Viss., Caninia cf. subibicina McCoy, Lithostrotion ex gr. volkovae Dobrol., as well as Viséan Namurian rugose corals: Clisiophyllum sp., Caninophyllum sp., Dibunophyllum ex gr. turbinatum MсСоу. (Ta'irov, Chern'er, 1970). E.Ya. Leven and A.Kh. Kafarskii (1965) point to the finds in this layer of fusulinids from the Middle Carboniferous.

Age

Due to the small amount of paleontological data, the age of the West Karadzhilgin Fm can be determined only as early-middle Carboniferous, and it is not excluded that there may be Upper Carboniferous deposits in it due to the overlying of the suite without an apparent unconformity by the rocks of the Lower Permian.

Age Span:

Beginning stage:

Visean

Fraction up in beginning stage:

0.0

Beginning date (Ma):

346.73

Ending stage:

Moscovian

Fraction up in the ending stage:

1.0

Ending date (Ma):

307.02

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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