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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Ushkarv Formation

Ushkarv Fm

Period:

Carboniferous

Age Interval:

Serpukhovian-Visean (C₁ n), D1

Province:
SW Tajik

Type Locality and Naming

The suites were delineated by N.G. Vlasov and I.V. Pyzyanov (Vlasov, 1961, 1963). Middle formation in Namurian Gr.

Synonym: Ushkarv suite, ушхарвская свита

Reference section:

Lithology and Thickness

(2000 m), composed of characteristic "spectacle" tuffs, tuff-breccias, in which the rock fragments are light green in color, cemented by dark green tuff cement. The rock fragments in the tuff-breccias are represented by plagioclase and pyroxene. Rhyolites are encountered. In places, there are lenses (10 - 100 m) of greenish-gray lava breccias, tuffaceous rocks, acidic tuffs, and limestones.

Lithology Pattern:

Volcanic_ash

Relationships and Distribution

Lower contact

Aspandous Fm

Upper contact

N. G. Vlasov considers the contact between the Ushkharv Fm and Jax Fm (считает контакт ушхарвскойи джакской свит) to be conformable. I. V. Pyzyanov (1964) supposes that the Ushkharv Fm unconformably overlies the Jax Fm.

Regional extent

They are distributed in the territory of Darvaz.

GeoJSON

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Fossils

In the middle part of the section (Ushkarv Fm) (ушхарвская свита) Visean-Serpukhovian corals Carcinophyllum (?) cf. septentrionale Gorsky; Lonsdaleia cf. tenuicolumnata Dobrol., L. cf. elegans Dobrol.; foraminifers Bradyina cf. cribrostomata Raus. et Reitl., Archaediscus vischerensis Grozd. et Leb., A. aff. conveksus Grozd. et Leb., Asterodiscus baschkiricus (Theod. et Krest.) are found.

Age

Based on the fossil data, it is considered as Serpukhovian-Visean

Age Span:

Beginning stage:

Visean

Fraction up in beginning stage:

0.9

Beginning date (Ma):

331.98

Ending stage:

Serpukhovian

Fraction up in the ending stage:

0.5

Ending date (Ma):

326.87

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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