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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Ouzbulazh Formation

Ouzbulazh Fm

Period:

Cretaceous

Age Interval:

upper Barremian-lower Albian, K1, D1, S3, C2, C2a

Province:
SW Tajik, North Tajik, Central W Tajik

Type Locality and Naming

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

The Berriasian? stage - middle substage of the Aptian stage is identified in the South Gissar, Dushan, Binsky, Kafirnigan, Vakhsh, Zaalaysky, and Darvaz districts includes the following horizons: 1-Karabil (Berriasian? Valanginian?); 2-Almurad (Valanginian-lower? Hauterivian); 3-Kyzyltash (upper? Hauterivian-lower? Barremian); 4-Okozbulak (upper Barremian-lower Aptian); 5-Kaligrek (middle Aptian). The Karabil horizon includes the Karabil Fm and the lower part of the Shirk Fm. The Almurad horizon includes the upper part of the Shirk Fm, the Almurad Fm, and the Vakhsh Fm. The Kyzyltash horizon is represented by the Kyzyltash Fm. The Ouzbulazh horizon includes the Ouzbulazh Fm and the lower part of the Obigarm Fm. The Kaligrek horizon is represented by the upper part of the Obigarm suite and the Aksuy Fm.

Synonym: Ouzbulazhsky horizon, Окузбулакский горизонт, Ouzbulazh suite, Oquzbulak suite

Lithology and Thickness

It consists of alternating reddish-brown argillites and clays containing rare layers of sandstones with gypsum, varicolored clays, and marls. The thickness is 80-170 m.

Lithology Pattern:

Claystone

Relationships and Distribution

Lower contact

Overlies the Kyzyltash Fm

Upper contact

Overlain by the Obigarm

Regional extent

Afghan-Tajik Basin; and the Ouzbulazh suite is widespread in South Gissar, Dushan, Kafirnigan, Vakhsh, Zaalaysky and Darvaz districts.

GeoJSON

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Fossils

In them, shells of late Barremian or early Aptian bivalves Exogyra tuberkulifera Koch et Dunck., Anomia laevigata Orb., Grammostomum shapsugensis Mordv. and ostracods Asciocythere tadjikistanensis Andr., A. babatagensis Andr., A. parabre vis Andr. et Oertli are found.

Age

Lower part of upper Barremian-lower Aptian

Age Span:

Beginning stage:

Barremian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

123.95

Ending stage:

Barremian

Fraction up in the ending stage:

1.0

Ending date (Ma):

121.40

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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