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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Dasgirak Formation

Dasgirak Fm

Period:

Cretaceous

Age Interval:

Upper Turonian (K₂¹), K1, D1, C2, C2a

Province:
SW Tajik, North Tajik, Central W Tajik

Type Locality and Naming

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

Synonym: Dasgirak horizon, Дасгирякекий1 Горизонт, Disgiryak Fm

Lithology and Thickness

In the Kafirnigan district, the Dasgirak horizon of the upper Turonian is represented by greenish-gray clays and marls with layers of argillites, limestones, and sandstones (20-50 m)

In the South Gissar region, The Dasgirak horizon (Дасгирякекий1 Горизонт) of the Upper Turonian consists of ostracodes with layers of greenish-gray clays. Thickness is 35- 50 m.

In the Dushanbe region, The Dasgirak horizon of the Upper Turonian is formed by ostracodes with layers of greenish-gray clays (35-50 m).

In the Vakhsh district, The Dasgiryaq horizon is formed by variegated clays and aleurolites containing layers of limestone and gypsum (35-55 m).

In the Darvaz district, The Dasgiryaq horizon of the upper Turonian consists of detrital limestones with layers of sandy clays, the thickness of it 15-30 m.

In the Karategin region, The Dasgirak horizon (Дасгирякский горизонт) of the upper Turonian is composed of greenish-gray siltstones, nodular limestones, sandstones, and shell limestones (15-17 m).

Lithology Pattern:

Shallow-marine marl

Relationships and Distribution

Lower contact

Overlies the Talhab Fm or lies with a sharp angular unconformity on the Paleozoic.

Upper contact

Underlies the Muzrabat Fm.

Regional extent

Afghan-Tajik Basin. It is widespread in South Gissar region, Dushanbe region, Kafirnigan district, Vakhsh district, Darvaz district, Karategin region.

GeoJSON

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Fossils

In the South Gissar region, The ostracodes are mainly composed of oyster shells Fatina (Costeina) costei (Coq.). In the clays, shells of ammonites Collignoniceras woolgari (Mant.), C. intermedium (Haas), and the shells of sea urchins Sternotalis planus (Mant.) are found.

In the Dushanbe region, formed by ostracods. The fauna remains here are analogous. The characteristics are similar to those described for the Southern Hissar district.

In the Karategin region, Fatina (Costeina) costei (Coq.).

Age

Upper-Middle Turonian

Age Span:

Beginning stage:

Turonian

Fraction up in beginning stage:

0.6

Beginning date (Ma):

91.19

Ending stage:

Turonian

Fraction up in the ending stage:

0.8

Ending date (Ma):

90.29

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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