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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Karauldyn Formation

Karauldyn Fm

Period:

Jurassic

Age Interval:

Toarcian – Aalenian (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: Karauldynskaya suite, Караулдынская свита

Reference section:

Lithology and Thickness

It is composed of gray-colored and red-colored sandstones and conglomerates; Gypsum is present in a number of regions. Among the pebbles, all pre-Jurassic rocks of the South-Eastern Pamir are recognized.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

The suite unconformably overlies the Carboniferous-Triassic strata, and in the Kourtike-Shakhtesai area, it overlies the Shakhtesay Fm (шахтесайской свите) with erosion.

Upper contact

It is conformably overlain by the limestones of the Mamasair Fm (мамазаирской свиты).

Regional extent

It is widespread in the basins of the rivers Irkaltdzhilga, Korteke, Shahtesay, Mamazair. It is established almost everywhere where the Jurassic sections of the Istyk type are developed.

GeoJSON

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Fossils

Organic remains have not been found in the formation.

Age

By its position in the section, it is considered Toarcian-Aalenian.

Age Span:

Beginning stage:

Toarcian

Fraction up in beginning stage:

0.3

Beginning date (Ma):

181.35

Ending stage:

Aalenian

Fraction up in the ending stage:

1.0

Ending date (Ma):

170.90

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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