Karadavan Formation

Karadavan Fm

Period:

Carboniferous

Age Interval:

Early Carboniferous (Tournaisian–Visean), F10b

Province:
Fergana

Type Locality and Naming

Along the Karadavan ridge, Alai ridge. A.I. Goncharov et al., 1961 (176, p. 20). Uppermost formation in Alay Gr

Synonym: Karadavanskaya Formation, Карадаванская св.

Lithology and Thickness

Limestones, dolomitic limestones, dolomites. In places, conglomerate-breccias lie at the base. Thickness 30-460m.

Lithology Pattern:

Dolomitic limestone

Relationships and Distribution

Lower contact

Conformably or with erosion lies on the Nazarin Fm

Upper contact

Schematic stratigraphic column indicates Alay Gr

Regional extent

High foothills of the Alai ridge. It is part of the Alay Gr.

GeoJSON

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Fossils

Contains foraminifers - Endothyra inflata Lip., Quasiendothyra communis Raus., Quasituberitina magna Pojark., Eoendothyranopsis michoti (Con. et Lys.), Glomospirella Spirillinoides Grozd. et Leb., Eostaffella prisca Raus., brachiopods - Camarotoechia cf mitcheldeanensis Vaugh., Dictyoclostus burlingtonensis Hall., Fusella tornacensis Kon. and others, characteristic of the Tournaisian-Visean age.

Age

It is attributed to the Tournaisian-Visean stage of the Lower Carboniferous. In the Strat. Sl. (439) it is attributed to the Tournaisian stage. On the State Geol. Map-500 of Uzbekistan (460) the suite is assigned a Tournaisian-Visean age.

Age Span:

Beginning stage:

Tournaisian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

359.30

Ending stage:

Visean

Fraction up in the ending stage:

0.2

Ending date (Ma):

343.45

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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