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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Bulgarin Formation

Bulgarin Fm

Period:

Cretaceous

Age Interval:

Upper Maastrichtian, 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: Bulgarin horizon.

Lithology and Thickness

In the Kafirnigan area, it is light gray limestones and dolomites with a thickness of 2 - 20 m. In Vakhsh area, it is gray and gray-brown limestones with a thickness of 20-50 m. In the Zaalay and Darvaz districts, it is composed of brownish-red limestones with a thickness of 20-50 m.

Lithology Pattern:

Dolomitic limestone

Relationships and Distribution

Lower contact

Overlies the Udantau Fm of limestone-dolomite.

Upper contact

Overlain by erosion with the Akdjar Fm of lower Paleocene.

Regional extent

Afghan-Tajik Basin region.

GeoJSON

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Fossils

Dolomites often abound in rudist cores and the formation contain remains of late Maastrichtian corals. In Vakhsh area, it contains Biradiolites boldjuanensis Bobkova. In the Zaalay and Darvaz districts, it has remains of rudists Bifadiolites boldjuanensis Bobkova, Orbignya vlasovi Bobkova, Lapeirouseia boldjuanensis Bobkova, and others

Age

Upper Maastrichtian

Age Span:

Beginning stage:

Maastrichtian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

69.11

Ending stage:

Maastrichtian

Fraction up in the ending stage:

1.0

Ending date (Ma):

66.04

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.