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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Bachauldin Formation

Bachauldin Fm

Period:

Carboniferous

Age Interval:

upper Bashkirian - lower Moscovian (C v₂-m₁), C1, C1a, C1b, C1c

Province:
Central W Tajik

Type Locality and Naming

Includes in Hisar-Zarafshan ranges, and Obisafit, Turkparidin, Chakykalya typesections. It is distinguished and detailed by V. D. Saltovskaya (1965; 1966; 1974).

Synonym: Bachauldin suite, Бачаульдинская свита

Reference section:

Lithology and Thickness

It is represented by limestone conglomerates, conglomerate-breccia (at the bottom), fusuline algal limestones with lenses of cherts. Thickness 100-150 m.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

Upper contact

The Bachtysurkh Fm (Бачаульдинская свита) is conformably or with slight erosion overlain by the upper Moscovian - upper Carboniferous Daraxtisurkh Fm (дарахтисурхской свитой).

Regional extent

They are widespread in the Turkestan, Zarafshan-Gissar, and Karategin regions.

GeoJSON

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Fossils

In the limestones, there are upper Bashkirian - lower Moscow algae - Danezella lutugini Masl., Beresella erecta Masl. et Kul.; fusulines Pseudostaffella ex gr. gorskyi (Dutk.), Verella spicata Dalcu., Eofusulina ex gr. triangula Raus. et Bel. Palaeofusulina subtillisima Putr. and others; brachiopods Choristites priscus Eichw; corals Chaetetes radians Fisch., Ch. tompsoni Reed, Jakovleviella ex gr. lissitzini Fom. and others.

Age

From the fossil data, it is represented upper Bashkirian - lower Moscovian for schematic stratigraphic purpose.

Age Span:

Beginning stage:

Bashkirian

Fraction up in beginning stage:

0.8

Beginning date (Ma):

316.80

Ending stage:

Moscovian

Fraction up in the ending stage:

0.4

Ending date (Ma):

311.90

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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