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

Karatash Formation

Karatash Fm

Period:

Proterozoic

Age Interval:

Lower Proterozoic, B1a

Province:
SW Gissar

Type Locality and Naming

Along the Karatash River, Gissar Range. V.A. Khokhlov, L.P. Ignatiev in 1963 as part of the Baysun series, I.M. Mirkhodjaev and others, 1977 (307, p.68). Lowermost formation in Baysuntau Gr

Synonym: Karatashian Suite, Каратасская св.

Lithology and Thickness

Characteristic of the structure is a finely rhythmic (two-rhythmic) structure of the lower and upper parts of the section, caused by thin (0.2-5 m) interbedding of biotite and cordierite-sillimanite-biotite, sometimes with garnet, gneisses, quartzite layers, often graphite-containing. In the middle parts of the section, the rhythmic structure of the suite disappears, and massive cordierite-sillimanite-biotite and biotite-sillimanite gneisses with sporadically occurring garnet appear. The section ends with a layer of thin-banded biotite crystalline slates. Thickness more than 2500m.

Lithology Pattern:

Gneiss

Relationships and Distribution

Lower contact

The base of the Karatash Fm is not exposed.

Upper contact

The boundary with the overlying Khodzha-Buzbarak Fm passes at the top of the body of granite-gneisses.

Regional extent

Southwest Gissar, Baysuntau, Susyztau, basin of the Karatash, Palgar, NovDia, Rupag, lower reaches of the Kishlaksay and Shirt rivers.

GeoJSON

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Fossils

Age

Age, according to O.N. Nikitina and others (1993), - conditionally Early Proterozoic; Along A.K. Bukharin and others (122), Early Paleozoic; according to M.A. Akhmedjanov and others (73; 75), - conditionally Upper Archean and Lower Proterozoic; A.V. Pokrovsky (349) identifies the deposits of the K. suite in the Palgar Fm of conditionally Riphean age; in the Stratigraphic Lexicon (442) it is conditionally attributed to the Archean; on the State Geological Map-500 of Uzbekistan (460) - conditionally to the Lower Proterozoic. The Early Proterozoic age is established conditionally by the occurrence at the base of the section of the Baysuntau Fm.

Age Span:

Beginning stage:

Tonian

Fraction up in beginning stage:

0.15

Beginning date (Ma):

958.00

Ending stage:

Tonian

Fraction up in the ending stage:

0.3

Ending date (Ma):

916.00

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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