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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Kurpin Formation

Kurpin Fm

Period:

Carboniferous

Age Interval:

Late Moscovian - Late Carboniferous (C2-3 kr), S2

Province:
North Tajik

Type Locality and Naming

Synonym: Kurpinskaya Suite, Курпинская свита

Reference section:

Lithology and Thickness

Clayey sandstone. In the Kurpin Fm, there is a rhythmic alternation of clayey shales, polymictic sandstones, and gray, yellowish, and greenish siltstones. The thickness of the suite is 500-1000 m. In subordinate quantities, there are interlayers and beds of polymictic conglomerates and gravels, locally the amount of these rocks significantly increases, especially in the upper parts of the suite. Gray limestone and dolomite interlayers and beds are not uncommon. Sometimes there are thin interlayers of silicites, as well as tabular bodies of acidic and intermediate effusives up to 2 m thick.

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

The Kurpin Fm lies with an angular unconformity on various Paleozoic strata

Upper contact

It is overlain by multicolored conglomerates of the Permian Kumbel Fm with an angular unconformity.

Regional extent

It is widespread in the central part of the Turkestan region in the watershed part of the Turkestan Range (Mount Kurganak, upper reaches of the Rasraut River).

GeoJSON

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Fossils

In the limestone cobbles in the conglomerates of this suite, remains of Silurian, Devonian, and Carboniferous fauna are often found, including the Lower Moscow substage. In the lenses of limestones, shells of Late Moscow foraminifera Fusulina cf. dunbari Sosn. and remains of Late Carboniferous algae Epimastopora cf. piai Korde were found. East of the described territory, in the Kurpinskaya Suite, Late Moscow Fusulina cf. bocki Moell., F. schwagerinoides Depr., Fusulina elegans Raus. et Bel., F. typica Lee et Chen, as well as Late Carboniferous Tricitites sp. were found.

Age

Taking into account the indicated faunal remains, as well as the age of the underlying and overlying deposits, the age of the Kurpin Fm is determined as Late Moscow - Late Carboniferous.

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.8

Beginning date (Ma):

308.65

Ending stage:

Gzhelian

Fraction up in the ending stage:

1.0

Ending date (Ma):

298.89

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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