Koykebiltau Formation

Koykebiltau Fm

Period:

Carboniferous

Age Interval:

Lower Bashkirian, CK6

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along the Koykebiltau Mountain, watershed of the Arysy-Keltemashat rivers, western part of the Talas Alatau range. O.I. Sergunyukova, 1959 (382, p. 64). Stratotype on the southern slope of Koykebiltau Mountain.

Synonym: Koykebiltauskaya Suite, Койкебильтауская св.

Lithology and Thickness

Layered, dark gray, biomicroitic, organogenic-detrital limestones, often with clay admixture and flint nodules, often layers of shell limestone are encountered. Thickness 70-250m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

Lies conformably on the Keltemashat Fm

Upper contact

Conformably overlain by the Uzunbulak Fm or Sleslavin Fm. (165; 439; 460).

Regional extent

South-western spurs of the Talas Alatau range.

GeoJSON

null

Fossils

Contains conodonts Declinognathodus noduliferus El. et Gr., together with Gnathodus bilineatus Roun. (praenoduliferus zone) at the bottom of the suite; brachiopods - Linoproductus corrugatus M'Coy, Productus concinnus Sow., Rugosochonetes dalmanianus Kon.; foraminifers Plectostaffella varvariensis (Br. et Pot.), Propermodiscus krestovnikovi Vdov., Neoarchaediscus postrugosus (Reitl.).

Age

Middle Carboniferous (Lower Bashkirian)

Age Span:

Beginning stage:

Bashkirian

Fraction up in beginning stage:

0.1

Beginning date (Ma):

322.58

Ending stage:

Bashkirian

Fraction up in the ending stage:

0.3

Ending date (Ma):

320.93

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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