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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Zarkuin Formation

Zarkuin Fm

Period:

Carboniferous

Age Interval:

Late Bashkirian - Early Moscovian (C₂ b₂-m₁), C2, C2a

Province:
Central W Tajik

Type Locality and Naming

Includes in Dushanbe-west Shirkent-Luchob, east Shirkent-Luchob. It was delineated in 1962 by L.I. Gay and V.P. Loziev. Later, it was studied by F.R. Bensh (1969) and D.A. Starshinin.

Synonym: Zarkuinskaya formation, zаркуинская свита, Zarquin Fm, заркуинской свите.

Reference section:

Lithology and Thickness

It is composed of lavas, tuffs, tuff-breccias of andesite-dacite composition, interbedded with organogenic limestones. The incomplete thickness of the formation is 1200 m.

Lithology Pattern:

Volcanic_ash

Relationships and Distribution

Lower contact

Unconformably underlain by Chinar Fm

Upper contact

overlying rocks are unknown.

Regional extent

They are spread in the Dushanbe region in the valley of the river Qafirnigan.

GeoJSON

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Fossils

The limestones contain foraminifera of the upper substage of the Bashkirian stage and the lower substage of the Moscow stage, such as Ozawainella mosquensis Raus., Eostaffella parastruvei var. chusovensis Kir., Pseudostaffella compressa Raus., Profusulinella ovata Raus., Pr. prisca (Depr.), and others.

Age

Based on the fossil assemblage Late Bashkirian - Early Moscovian

Age Span:

Beginning stage:

Bashkirian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

319.28

Ending stage:

Moscovian

Fraction up in the ending stage:

0.1

Ending date (Ma):

314.34

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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