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

Kurbanazin Formation

Kurbanazin Fm

Period:

Ordovician

Age Interval:

Floian-Darriwilian, N6

Province:
Nuratau

Type Locality and Naming

In the village of Kurbanzi, N. Nuratau Ridge. A.K. Bukharin et al., in 1990 (460, p.59).

Synonym: Kurbanazin Suite, Курбанзайская св.

Lithology and Thickness

Dark gray, black, green, yellow, and raspberry claystone (argillites), clay-siliceous, mica-siliceous slates with layers and lenses of fine-grained platy silty-claystone (aleuropelites), dolomites, and limestones. Thickness 100-200m.

Lithology Pattern:

Claystone

Relationships and Distribution

Lower contact

Lower contact unknown

Upper contact

Stratigraphically conformable with the Ilonchisay Suite (165).

Regional extent

North slope of the North Nuratau Ridge, basins of the Ilonchi, Asman, and Chagalak streams. The suite is a complete lithological and age analog of the Jalatark Fm. It is correlated with the Telibay Fm of the South Bukantau.

GeoJSON

null

Fossils

Contains Middle Ordovician radiolarians - Inanigutta cf. complanata (Naz.), I. aff. unica (Naz.) and others; early-middle Ordovician chitinozoans - Desmochitina minor f. cocca Eis., D. minor f. typica Eis., Conochitina parva Umn., Linochitina pissotensis Paris. and others; sponge spicules, traces of mud-eaters.

Age

Previously, these deposits were assigned by P.N. Podkopaev et al. (1964) to the lower part of the Ilonchisay Fm of the Lower Silurian, R.R. Usmanov et al. (1984) considered them part of the Ilonchisay Fm; Z.M. Abdurazimova et al. (1993, 1996), R.R. Usmanov et al. (1999) correlate them with the Jalatark Fm of the Lower-Middle Ordovician. In the monograph (165) and on the State Geological Map-500 of Uzbekistan (460), the suite is dated to the Early-Middle Ordovician.

Age Span:

Beginning stage:

Floian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

477.08

Ending stage:

Darriwilian

Fraction up in the ending stage:

0.5

Ending date (Ma):

463.80

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Z.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)”