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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Vozgin Formation

Vozgin Fm

Period:

Carboniferous

Age Interval:

Upper Bashkirian - Lower Moscovian (C₂ vz), D1

Province:
SW Tajik

Type Locality and Naming

It is identified in its western part by N. G. Vlasov (1961).

Synonym: Vozginskaya suite, Возгинская свита

Reference section:

Lithology and Thickness

South-West of the Hingou River valley, the Vozhin Fm is represented by gray small-gravel conglomerates, sandstones, and limestones, the quantitative ratios between which are variable. The thickness of the suite is 200 - 500 m.

In the eastern part of the Darvaz district, in the valley of the Muksu River, a thickness is attributed to the Vozhinskaya suite, composed in the lower part (200 m) of a varied package of limestones, sandstones, slates, conglomerates, and in the upper part - tuffaceous sandstones (200 m).

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

It is locally distributed - in the depressions of the ancient relief, where it lies with a sharp angular discordance on the greenstone sedimentary-effusive rocks of the Tournaisian - Serpukhovian stages (Kalaikhumb Fm - Dzhakska Fm) and contains in conglomerates the rounded pebbles of these rocks. Here in the eastern part of the Darvaz district, these rocks also lie sharply discordant on the volcanics of the Lower Carboniferous.

Upper contact

It is overlain with erosion and without apparent angular discordance by the Upper Moscovian - Upper Carboniferous limestones, which beyond the depressions of the ancient relief lie directly on the greenstone Lower Carboniferous.

Regional extent

Spread in the Darvaz district.

GeoJSON

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Fossils

In the lower part of the Vozhin Fm, remains of foraminifera Eostaffella aff. pseudostruvei Raus. et Bel., Pseudostaffella ex gr. antiqua (Dutk.), Ps. cf. krasnopolski Dutk. and corals Darwasophyllum irregular compacta Pyzh., characteristic of the tops of the Bashkirian stage, are collected. 30-40 m higher, foraminifera of the lower sub-stage of Moscovian spyca Profusulinella cf. prolibrovitchi Raus., Pr. parva Lee et Chen, Pr. prisca Depr., Pseudostaffella ozawai Lee et Chen were found.

In the eastern part of the Darvaz, In them, Goniatites Girtioceras inostrancewi Karp. were found, characterizing the age interval from the Serpukhovian to the Bashkirian stage inclusive.

Age

The fossil data indicates Upper Bashkirian - Lower Moscovian

Age Span:

Beginning stage:

Bashkirian

Fraction up in beginning stage:

0.7

Beginning date (Ma):

317.63

Ending stage:

Moscovian

Fraction up in the ending stage:

0.2

Ending date (Ma):

313.52

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.