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

Karaiz Formation

Karaiz Fm

Period:

Cretaceous

Age Interval:

lower Albian - lower + middle Cenomanian, Z5

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along Mount Karai, West Uzbekistan. O.S. Vyalov, S.I. Ilyin, G.Ya. Meyer, and others, 1947 (158, p.20).

Synonym: Karaizskaya Formation, Караизская св.

Lithology and Thickness

I.S. Suleimanov identified three sub-suites in the suite.

Upper sub-suite - variegated sands, sandstones, gravelites with clay and siltstone (aleurolite) layers. Thickness 30-50m.

Middle sub-suite - gravelites, greenish-gray sandstones, sands with clay layers. Thickness 24-50m.

Lower sub-suite - alternation of conglomerates, gravelites, variegated siltstone (aleurolites) with clay layers. Thickness 40-80m.

Lithology Pattern:

Coarse-grained sandstone

Relationships and Distribution

Lower contact

The suite conformably overlies the Azkamar Fm

Upper contact

It is overlain with erosion by the Sukaytin Fm.

Regional extent

Mounts Zirabulak-Ziaetdinsky, Karai, in the adjacent plains, well.

GeoJSON

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Fossils

Middle sub-suite – Contains marine bivalve mollusks Korobkovitrigonia korobkovi Sav.; gastropods - Nerineoptyxis amudariensis Pchel., foraminifera - Evolutinella ex gr. asiatica Zhuk., Trochammina ex gr. kugitangensis N. Byk.

Lower sub-suite – Contains foraminifera - Trochammina planoconvexa Mam., T. crumensis Tapp., Gaudryinopsis karaisensis (Suleim.), G. oblongus (Zasp.).

Age

Upper sub-suite – Assigned to the lower + middle Cenomanian. Middle sub-suite – Assigned to the upper Albian. Lower sub-suite – Assigned to the lower-middle Albian.Assigned to the lower Albian - lower + middle Cenomanian; according to I.S. Suleimanov (464), - to the Albian - Cenomanian, in the Stratigraphic section (446) - to the Albian (?) Senonian (?). (313; 445).

Age Span:

Beginning stage:

Albian

Fraction up in beginning stage:

0.25

Beginning date (Ma):

110.03

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