Namurian Gr

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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Namurian Gr

Period:

Carboniferous

Age Interval:

Visean – Serpukhovian (C₁ n), D1

Province:
SW Tajik

Type Locality and Naming

These suites were delineated by N.G. Vlasov and I.V. Pyzyanov (Vlasov, 1961, 1963).

Synonym: Namurian series

Reference section:

Lithology and Thickness

It is further divided into Aspandous, Ushkarv, and Jax Fm. Overall, they are formed by variegated and greenish tuffites, diabases, their tuffs and tuff-breccias, tuffaceous sandstones with interbeds and lenses of chalcedony, limestones, conglomerates with a total thickness of about 6000 m.

Lithology Pattern:

Volcanic_ash

Relationships and Distribution

Lower contact

They lie conformably on the Kalaykhumb Fm (калайхумбской свите) of Tournaisian and Visean age

Upper contact

They are overlain discordantly by the Late Bashkirian - Early Carboniferous Vozgin Fm (возгинской свитой) or Upper Moscovian - Upper Carboniferous limestones.

Regional extent

They are distributed in the territory of Darvaz.

GeoJSON

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Fossils

In the lower part of the section, according to I.V. Pyzyanov) there are remains of Goniatites Goniatites ex gr. granosus Portlock, Paragoniates newsoni (Smith.), Platygoniatites molaris Ruz., Cravenoceras sp., Uralopronorites mirus Lib., characteristic of the very lowest horizons of the Serpukhovian (Namurian) stage. In the middle part of the section, 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. In the upper part of the section, there are re-deposited organic remains of Visean-Serpukhovian age.

Age

Visean-Serpukhovian

Age Span:

Beginning stage:

Visean

Fraction up in beginning stage:

0.5

Beginning date (Ma):

338.54

Ending stage:

Serpukhovian

Fraction up in the ending stage:

1.0

Ending date (Ma):

323.40

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.