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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Barnavadzh Formation

Barnavadzh Fm

Period:

Proterozoic

Age Interval:

Neoproterozoic (Rf? br), V1

Province:
SE Tajik (Central W Pamir)

Type Locality and Naming

This is the lowermost formation in Vanch-Yazgulem Gr

Synonym: Barnavadzhskaya formation (Барнаваджская свита)

Reference section:

Lithology and Thickness

Composed of quartz-biotite, quartz-sericite, mica, sericite-chlorite shales, quartzites, and feldspar-quartz sandstones. Incomplete thickness of 1000 m. Among them, rare layers of marbles and sheet-like deposits of actinolite-epidote shales are encountered. In the lower part of the formation, quartzites and sandstones predominate, in the upper part - shales (Khamidov, 1967). In the sandstones of the Barnavadzhskaya formation, cross-bedding, wave ripple marks, and shrinkage cracks are clearly visible.

Lithology Pattern:

Sandstone

Relationships and Distribution

Lower contact

The underlying formations are unknown.

Upper contact

Yazgulem Fm

Regional extent

It is widespread in the western part of the Central Pamir.

GeoJSON

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Fossils

Age

Indicated as Riphean in the extracted literature, hence considered Neoproterozoic (Tonian) for schematic stratigraphic representation purpose.

Age Span:

Beginning stage:

Tonian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

1,000.00

Ending stage:

Tonian

Fraction up in the ending stage:

1.0

Ending date (Ma):

720.00

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.