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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Kumbel Formation

Kumbel Fm

Period:

Permian

Age Interval:

Lower Permian (P1? km), S2

Province:
North Tajik

Type Locality and Naming

It was delineated by A.P. Markovsky in 1939.

Synonym: Kumbelskaya suite, Кумбельская свита

Reference section:

Lithology and Thickness

It is represented by colorful, variously gravelly polymict conglomerates. In subordinate quantities, lenses and interlayers of red or brown gravelites, sandstones, siltstones, and clay slates are encountered in it. Separate blocks of carbonate rocks are found, having sizes up to several tens of meters in diameter. The incomplete thickness is 600 meters.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

Kurpin Fm. The Kumbel Fm (Кумбельская свита) lies with an angular unconformity on various Paleozoic rocks, including the Upper Moscow - Upper Carboniferous Kurpin Fm (курпинской свитa).

Upper contact

Overlying deposits are unknown.

Regional extent

It is exposed in the Tursunzoda area between the upper reaches of the Altykol and Rasraut rivers.

GeoJSON

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Fossils

In the limestone pebbles of the conglomerates in the Kumbelskaya suite, organic remains of the Silurian, Devonian, and Carboniferous, including Middle and Late Carboniferous foraminifers Fusulina cf. ozawai, are often contained Raus. et Bel., F. cf. dunbari Sosn., algae Epimastopora cf. piai (Korde) and brachiopods Choristites ex gr. mosquensis Fisch., Brachithyrina ex gr. strangvaysi (Vern.). In the interlayers of claystones and siltstones (silt like), shells of late Moscovian - late Carboniferous pelecypods Astartella vera Hall. have been found. In the Kumbelskaya Suite, remains of the flora Annularia orientalis Kaw., Sphenophyllum vermiculatum (Schl.), Pecopteris wongii Halle, P. cf. luiliana Lec., P. arborescens Schl., P. aff. candolleana Brongn., P. unita Brongn., Asterotheca hemiteliodes Brongn., A. cf. orientalis Schenk., Sigillaria ex gr. ichtiolepis Brongn., Ptichocarpus unitus Brongn., Callipteris? sp., Lecrosia? sp., Odontopteris? sp., Neuropteris sp., Phyllopheca sp., Walchia sp., Calamites sp., Lobatannularia sp. n. and others have also been detected.

Age

The presence in this complex of both late Carboniferous and early Permian elements gave grounds to D.A. Starshinin to consider the age of the Kumbelskaya Suite as late Carboniferous - early Permian. However, as D.A. Starshinin notes, T.A. Sikestel believes that the presence of Callipteris? sp. allows to attribute the entire Kumbelskaya Suite to the lower Permian. Based on this opinion, as well as the fact that similar red conglomeratic strata in other points of the Turkestan region (beyond the territory under consideration) contain in the pebbles remains of foraminifers of the Karachatur horizon of the lower Permian, i.e., they undoubtedly have a Permian age, it seems quite possible to consider the age of the Kumbelskaya Suite, albeit conditionally, as early Permian.

Age Span:

Beginning stage:

Sakmarian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

293.52

Ending stage:

Sakmarian

Fraction up in the ending stage:

1.0

Ending date (Ma):

290.51

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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