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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Chakobay Formation

Chakobay Fm

Period:

Jurassic

Age Interval:

Bajocian (J t-bj), Sar3

Province:
East Tajik (easternmost Pamir)

Type Locality and Naming

Includes in Sarykoln district (Istyk type section (Kunteisk and Kokchagin areas)

Synonym: Chakobay suite, Чакобайская свита

Reference section:

Lithology and Thickness

(100-200 m) is distinguished everywhere in the cap of the limestone part of the Toarcian-Bajocian strata section, composed of light gray and white, coarse and giant-bedded, often massive, largely reef limestones.

Lithology Pattern:

Reef limestone

Relationships and Distribution

Lower contact

Schematic stratigraphic column indicates the lower contact as Carboniferous-Triassic layers

Upper contact

Schematic stratigraphic column indicates the upper contact as Bathonian - Upper Jurassic deposits

Regional extent

It is widespread in the basins of the rivers Irkaltdzhilga, Korteke, Shahtesay, Mamazair

GeoJSON

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Fossils

Organic remains are represented by early Bajocian pelecypods - Amussiopsis pamirica Andreeva.

Age

Bajocian

Age Span:

Beginning stage:

Bajocian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

169.54

Ending stage:

Bajocian

Fraction up in the ending stage:

1.0

Ending date (Ma):

168.17

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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