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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Chelamchin Formation

Chelamchin Fm

Period:

Permian

Age Interval:

Lower Permian (P₁ u+kb), D1

Province:
SW Tajik

Type Locality and Naming

It was distinguished by N. G. Vlasov (Vlasov and Miklukho-Maklai, 1959).

Synonym: Chelamchinskaya suite, Ulyk and Kubergetin horizons, Safetdaronskaya Suite

Reference section:

Lithology and Thickness

It belongs to Ulyk and Kubergetin horizons. It is represented by dark gray siltstones and clay slates, often interbedded, with a thickness of 0-500 m, containing interlayers of dark gray fragmental detrital limestones.

The thickness of the described rocks is 200-1100 m

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

They conformably underlie Zygar Fm

Upper contact

They conformably overlie Gundarin Fm

Regional extent

It is widespread in the Darvaz district.

GeoJSON

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Fossils

In the suite, Ulyk fusulinids have been found: Kahlerina aff. Pachytheca Koch. -Dev., Pseudofusulina vulgaris Schellw. et Dyhr., Ps. kraffti Schellw. et Dyhr., Ps. paraprisca Chen, as well as Lower Permian corals Carinthiaphyllum heritschi Pyzh., Jatsengia sugranica Pyzh.

Age

Based on the fossil data, it is taken as Artinskian for schematic stratigraphic representation.

Age Span:

Beginning stage:

Artinskian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

286.91

Ending stage:

Artinskian

Fraction up in the ending stage:

0.8

Ending date (Ma):

284.74

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.