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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Udantau Formation

Udantau Fm

Period:

Cretaceous

Age Interval:

Upper Turonian (K₂¹), K1, D1, C2, C2a, S3, S4, S5

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: Udan Tau Fm, Udantau horizon, Udan Tau horizon

Lithology and Thickness

In the Kafirnigan area is represented by limestones and dolomites with a thickness of 3-35 m. The Udontau horizon in the Vakhsh area is composed of gray limestones with a thickness of 40-90 m. In the Zaalay and Darvaz districts, it corresponds to brownish-gray and cream limestones with a thickness of 40-80 m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Overlies the Daralitau Fm limestones.

Upper contact

Underlies the Bulgarin Fm dolomitic limestones.

Regional extent

Afghan-Tajik Basin.

GeoJSON

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Fossils

In the Kafirnigan area, remains of bivalves Neithea substriatocostata Orb., Plicatula hirsuta plicata Douv., Liostrea lehmanni Rom.; gastropods Desmieria divaricata Orb., and others. In Vakhsh area, remains of Gryphaea vesicu!aris Lam. In the Zaalay and Darvaz districts, it contains remains of Gryphaea vesicularis Lamı. Praeneothyris subdepressa (Stol.).

Age

Lower Maastrichtian

Age Span:

Beginning stage:

Maastrichtian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

72.17

Ending stage:

Maastrichtian

Fraction up in the ending stage:

0.5

Ending date (Ma):

69.11

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Chapman, J.B., et al. (9 co-authors), 2020. The Afghan-Tajik Basin: A composite record of sedimentary basin evolution in response to tectonics in the Pamir. Basin Research, 32(3), 525-545. https:/doi.org/10.1111/bre.12381.

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