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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Uruzbulak Formation

Uruzbulak Fm

Period:

Carboniferous, Permian

Age Interval:

Gzhelian-Asselian; M1-M3d

Province:
SE Tajik (SE Pamir)

Type Locality and Naming

Includes in SE Murghab district (Mynkhadjr type), SE Murghab district (Istyk type (Dunkeldyk area), SE Murghab district (Gurdumdin type), SE Murghab district (Gurdumdin type Kastanatdjilga, Buryukurmes rivers), SE Murghab district (Gurdumdin type Shin and Igrymiyu rivers), SE Murghab district (Gurdumdin type Gurumd and Kattamardzhana rivers).

Defined by Novikov (1976). It is the lower formation in the Bazardara Gr.

Synonym:

Lithology and Thickness

The “Uruzbulak Fm comprises black claystones and siltstones capped by bioclastic immature sandstones, bioclastic sandy limestones and siltstones.” (Angiolini et al., 2015).

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

As a rule, the rocks underlying the Bazardarin Gr are unknown, since it is the oldest in the section. Only in the basins of the rivers Kattamardjana and Zurcherdik (according to observations by V. I. Dronov) outcrops are exposed, which he considers basal for this suite. They lie with a sharp angular unconformity on the rocks of the Riphean? (Neoproterozoic) North Alichur Gr ( Severoalichur Gr ) The contacts with the surrounding rocks are tectonic.

Upper contact

Overlain by the basal marls (Bed 3) of the Tashkazyk Fm.

Regional extent

It is widespread in the Southeastern Pamir, in the North Alichur range.

GeoJSON

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Fossils

“The Uruzbulak Formation contains cold-water bivalves, conulariids, bryozoans and reported rare ammonoids of Carboniferous age (Leven, 1967; Pavlov, 1972). At the top of the formation, we collected a very well preserved assemblage of the infaunal bivalve Oriocrassatella sp. consisting of articulated shells mostly in life position. . . . Bivalves in the upper beds of the Uruzbulak Formation are restricted to the Sakmarian-Artinskian” Angiolini et al. (2015).

Age

Latest Carboniferous-earliest Permian

Age Span:

Beginning stage:

Gzhelian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

303.68

Ending stage:

Asselian

Fraction up in the ending stage:

1.0

Ending date (Ma):

293.52

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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

Angiolini, L., et al. (11 authors) (2015) From rift to drift in South Pamir (Tajikistan): Permian evolution of a Cimmerian terrane. Jour. Asian Earth Sciences, 102: 146-169. http://dx.doi.org/10.1016/j.jseaes.2014.08.001