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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Chumkartau Formation

Chumkartau Fm

Period:

Devonian

Age Interval:

Early Devonian (S₂-D₃), S4

Province:
North Tajik

Type Locality and Naming

Decisions..., 1959.

Synonym: Chumkartauskaia suite, чумкартаускую

Reference section:

Lithology and Thickness

The lower part of the Chumkartau Fm (19-117 m) consists of clayey and sandy limestones, with layers of gravelites, clay shales, sandstones.

The upper part of this suite (100 m), which is characterized by fewer coarse clastic rocks, belongs to the Lower Devonian and is divided into Shishkat, Kshut, and Pandzhrud layers (Shevchenko, 1966; Lavrusevich, 1968).

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

Upper contact

Overlain by Shingak Fm

Regional extent

They are widespread in the southern part of the Turkestan region in the valley of the Zeravshan River.

GeoJSON

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Fossils

In the lower part, Favosites lazutkini Tchern., Squameofavosites tchortangensis Chekh., Syringopora ferganensis Fom., Gyalophyllum angelini Wdkd., Rhizophyllum gotlandicum Roemer, Mucophyllum crateroides Ether., Strombodes sokolovi Lavrus., Lissatrypa columbella (Barr.), Conchidium knighti Sow., and others (Lavrusevich, 1968). In the upper part, Favosites clarus Yanet, Favosites brusnitzini Peetz, Barrandeophyllum perplexum Barr., Spongophyllum halysitoides Ether., Lyrielasma chapmani Pedder, Camarotoechia famula Barr., Stegerhynchus cf.; nympha (Barr.), Cymostrophia stephani (Barr.), Karpinskia conjugula Tschern., Monograptus hercynicus Perner, and others.

Age

Early Devonian

Age Span:

Beginning stage:

Lochkovian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

415.70

Ending stage:

Emsian

Fraction up in the ending stage:

1.0

Ending date (Ma):

394.30

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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