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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Aspandous Formation

Aspandous Fm

Period:

Carboniferous

Age Interval:

Middle 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). Lowermost formation in Namurian Gr.

Synonym: Aspandous suite, аспандоуская свита, Obimangit suite, обимангитская свита

Reference section:

Lithology and Thickness

In its section (1500-1900 m) dark brown, violet oligoclase and andesine albite-altered porphyrites prevail. Occasionally, in the suite, there are interbeds and lenses of reddish-gray limestones.

Lithology Pattern:

Volcanic_ash

Relationships and Distribution

Lower contact

Kalaykhumb Fm

Upper contact

Ushkarv Fm

Regional extent

They are distributed in the territory of Darvaz.

GeoJSON

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Fossils

Occasionally, in the suite, there are interbeds and lenses of reddish-gray limestones, in which the Lower Serpukhovian Goniatites are found in the very base of the suite. 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.

Age

Fossil data indicates Serpukhovian, but being the lowest in the section, it is considered as middle Visean for schematic stratigraphic representation.

Age Span:

Beginning stage:

Visean

Fraction up in beginning stage:

0.5

Beginning date (Ma):

338.54

Ending stage:

Visean

Fraction up in the ending stage:

0.9

Ending date (Ma):

331.98

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.