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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Obizard Formation

Obizard Fm

Period:

Carboniferous

Age Interval:

late Moscovian (C2-3 ob), S2

Province:
North Tajik

Type Locality and Naming

It was distinguished by V. D. Saltovskaya (1966).

Synonym: Obizardskaya Suite, Обизардская свита

Reference section:

Lithology and Thickness

Gravels, sandstones, and shales. In the lower part, it consists of alternately occurring gravels, sandstones, and shales (a typically flysch thickness), the middle part is composed of a horizon of various gravel to boulder conglomerates, the upper part - a rhythmic alternation of gravels, sandstones, and shales. In the conglomerates, in addition to clasts of sedimentary rocks, fragments of various granites are present. Ooids and volcanic rocks. The incomplete suite power is 1000 m.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

Spatially, the Obizard Fm is closely associated with the Vashan Fm, вашанской свитой and replaces it without visible discordance in the section.

Upper contact

Regional extent

It is widespread in the Turkestan region, in the valley of the Zarafshan River.

GeoJSON

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Fossils

In the limestone cobbles, boulders, and blocks of the middle part of the suite, numerous remains of algae, foraminifera, corals, and brachiopods of the Silurian, Devonian, and Viséan stage of the Lower Carbon were found (Saltovskaya, 1974). In the cement of conglomerates and from sandstones, Middle Carboniferous Ungdarella uralica Masl., Beresella sp., Profusulinella sp. were identified.

Age

Considering the above data, as well as comparing the deposits of the Obizard Fm with similar deposits in terms of composition and relationships, developed in adjacent areas, its age is accepted as late Moscovian - conditionally late coal-bearing.

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

311.09

Ending stage:

Moscovian

Fraction up in the ending stage:

0.8

Ending date (Ma):

308.65

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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