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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Akkapchingay Formation

Akkapchingay Fm

Period:

Cretaceous

Age Interval:

Upper Albian (K₁¹), K1, D1, C2, C2a

Province:
SW Tajik, Central W Tajik

Type Locality and Naming

Includes in Khation Region, Darvaz district, Dushanbe - west Shirkent-Luchob, Dushanbe - east Shirkent-Luchob

Upper substage of the Aptian stage and Albian stage in the Turkestan, Zarafshan-Gissar, South Gissar, Karategin, Dushanbe, Qafirnigan, Vakhsh, Zaalai and Darvaz districts includes five horizons: 1 – Karakuz (Upper Aptian - Lower Albian); 2 - Derbent (Lower Albian); 3 - Babatag (Middle Albian); 4 – Akkapchigay (Upper Albian); 5 - Shirabad (Upper Albian). Corresponding to these are variegated sandstones, argillites and clays containing layers of limestone, less often gypsum and conglomerates. Their total thickness is 100-800 m.

Synonym: Akkapchigay, aккапчиrайокий, Аккапчиrай'ский горизонт, Akkapchigai horizon, Akkapchigai suite, Fandaryn suite, Fandaryn Fm

Lithology and Thickness

The Akkapchigai horizon in the Zeravshan-Gissar region includes the lower part of the Fandaryn suite (Dzhalilov et al., 1971), represented by non-marine red-colored sandstones, conglomerates, and siltstone-clay rocks with a thickness of 60-80 m. In the South Gissar, Dushanbe, and Kafirnigan districts, this horizon corresponds to the Akkapchigai suite, mainly composed of gray clays and siltstones with a thickness of 7-80 m.

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

Overlies the Babatag Fm.

Upper contact

Overlain by the Shirabad Fm.

Regional extent

Afghan-Tajik Basin. It is distributed in the South Gissar, Dushanbe, and Kafirnigan districts

GeoJSON

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Fossils

Rich complexes of the Hysteroceras orbignyi and Pervinquieria inflata zones have been found in them.

Age

Upper-Middle Albian

Age Span:

Beginning stage:

Albian

Fraction up in beginning stage:

0.6

Beginning date (Ma):

105.58

Ending stage:

Albian

Fraction up in the ending stage:

0.8

Ending date (Ma):

103.04

Depositional setting

Freshwater environment

Depositional pattern:

Additional Information

Compiler:

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