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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Shahtesay Formation

Shahtesay Fm

Period:

Jurassic

Age Interval:

Toarcian (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: Shahtesayskaya suite, Шахтесайская свита, Shakhtesai Fm

Reference section:

Lithology and Thickness

It is composed of variegated, differently grained sandstones, gravelites and conglomerates with lenses of limestones and brown coals. (20-50 m).

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

The formation is bounded from below and above by surfaces of erosion. 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

In the limestones, remains of Toarcian pelecypods-Amussiopsis paradoxa Münst. have been encountered.

Age

Fossil data indicates it is Toarcian.

Age Span:

Beginning stage:

Toarcian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

184.20

Ending stage:

Toarcian

Fraction up in the ending stage:

0.3

Ending date (Ma):

181.35

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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