Kauzan Formation

Kauzan Fm

Period:

Carboniferous

Age Interval:

Middle Carboniferous (Upper Bashkirian-Lower Moscovian), F10b

Province:
Fergana

Type Locality and Naming

Named after the Kauzan River, Alay Range. V. I. Kotel'nikov in 1974 (459, p. 280). A.D. Miklouho-Maclay and G.S. Porshnyakov (176) distinguished the deposits of the K. suite under the names Tuyukdangin and Pyrkaf suites. Along A., the independence of the Tuyukdangin suite was not confirmed. V.I. Kotel'nikov proposed to combine these suites into one Kauzan suite. (443; 459; 460). Upper formation in the Andygen Gr.

Synonym: Kauzan Suite, Каузанская Cb., Kausanian suite

Lithology and Thickness

In its composition, layered and massive algae-foraminiferal and oolitic-micritic limestones, "spotted". Bauxite lenses, allite, limestone-allite conglomerate-breccia. Thickness 40-400m.

Lithology Pattern:

Oolitic limestone

Relationships and Distribution

Lower contact

Lies with erosion or in a continuous section on the rocks of the Gaz Fm or with erosion on Lower Carboniferous limestones

Upper contact

Lies with erosion or in a continuous section overlies the Middle Carboniferous Tolubay Fm.

Regional extent

South Fergana, northern foothills of the Alay Range. Limited on the territory of Uzbekistan, most complete sections in Kyrgyzstan.

GeoJSON

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Fossils

In the lower part of the section, foraminifera Aljutovella aljutovica (Raus.), Profusulinella convoluta Lee et Chen, Pseudostaffella antiqua (Dutk.), P. ex gr. gorskyi (Dutk.), Verella acuminata Rum., brachiopods Choristites priscus (Eichw.), C. ex gr. mosquensis (Fisch.), C. bisulca tiformis Sem., characteristic of the Upper Bashkirian-Lower Moscovian substage. In the upper part, Upper Moscovian foraminifera - Fusulinella ex gr. colaniae Lee et Chen, Fusulina antiqua Raus.

Age

Age Span:

Beginning stage:

Bashkirian

Fraction up in beginning stage:

0.7

Beginning date (Ma):

317.63

Ending stage:

Moscovian

Fraction up in the ending stage:

0.1

Ending date (Ma):

314.34

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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