Neogene

Paleogene

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Mesoproterozoic

Paleoproterozoic

Main source = Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian) Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

Chorrokh Formation

Chorrokh Fm

Period:

Cretaceous

Age Interval:

lower Cenomanian, B1a

Province:
Bukhara-SW Gissar

Type Locality and Naming

Along the Chorrox pass, central part of the Babatag ridge. Yu.N. Andreev, 1968 (190, p.43). Stratotype at Chorokh Pass.

Synonym: Chorrox Suite, Чорохская св., Chorokh Fm, Chorrox Fm

Lithology and Thickness

Divided into two subformations.

Upper - alternation of greenish-gray calcareous clays, sandstones, shell limestones; at the bottom - raspberry clays and gypsums. Thickness 46m.

Lower - gray and dark gray sandy clays with interlayers of shell limestones. Thickness 51m.

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

The formation conformably overlies the Shirabad Fm

Upper contact

It is conformably overlain by the Akmechet Fm.

Regional extent

Babatag Range.

GeoJSON

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Fossils

Upper - Contains marine bivalve mollusks - Liostrea rouvillei Coq.; foraminifers - Rotaliatina asiatica N. Byk., Conorbinopsis aktagi (N. Byk.).

Lower - Contains marine bivalve mollusks - Rhynchostreon columbum (Lam.); foraminifers - Trochammina kugitangensis N. Byk.

Age

It belongs to the lower Cenomanikan. The lower part of the formation is included in the Tyubegatan Horizon, the upper part - in the Karikansai Horizon. (56; 189; 383; 446; 452).

Age Span:

Beginning stage:

Cenomanian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

100.50

Ending stage:

Cenomanian

Fraction up in the ending stage:

0.4

Ending date (Ma):

97.86

Depositional setting

Depositional pattern:

Additional Information

Compiler:

I.M. Abdurazimova – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”