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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Balyandkin Formation

Balyandkin Fm

Period:

Permian

Age Interval:

Upper Permian (P₂ bl), Ka1

Province:
NE corner Tajik

Type Locality and Naming

It was distinguished in 1936 by G.A. Dutkevich and M.I. Shabalkin.

Synonym: Balyandkinskaya suite, Баляндкиикская свита

Reference section:

Lithology and Thickness

It is composed of black slate-like bituminous fusulinid limestones of about 800 m thickness.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

They conformably overlie the Lower Permian Zulumart Fm

Upper contact

It is conformably overlain by the "silver slates" of the Pamir horizon.

Regional extent

It is widespread in the Karakulsky district in the valleys of the Balyandkinskaya and Zulumart rivers.

GeoJSON

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Fossils

The Balyandkinskaya limestones everywhere is saturated with remnants of fusulinids of the Murghab horizon. The most complete list is provided by E. Ya. Leven (1967): Polydiexodina afghanensis Thomps., Neoschwagerina schuberti Thomps., N. margaritae Depr., N. cf. katoi Oz., Verbeekina verbeeki (Gein.), and others.

Age

Upper Permian

Age Span:

Beginning stage:

Wuchiapingian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

259.55

Ending stage:

Wuchiapingian

Fraction up in the ending stage:

0.2

Ending date (Ma):

258.49

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.