Uzunbulak Formation

Uzunbulak Fm

Period:

Carboniferous

Age Interval:

Lower Bashkirian, CK6

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along the Uzunbulak River, left tributary of the Keltmashat River, Koykebiltayu Mountains, western part of the range Talas Alatau. Z. S. Rumyantseva in 1975 (165, p. 77). Stratotype on the southern slope of Koykebiltayu Mountain

Synonym: Uzunbulak Suite, Узунбулакская св.

Lithology and Thickness

Predominantly medium-bedded organogenic, organogenic-detrital limestones with layers of oolitic, algal varieties. Lenses and nodules of flint are present. Thickness up to 300 m.

Lithology Pattern:

Oolitic limestone

Relationships and Distribution

Lower contact

Conformably overlies the Koykebiltau Fm

Upper contact

Contacts with the effusives of the Upper Paleozoic with unclear stratigraphic relationships.

Regional extent

Southwestern spurs of the Talas Alatau.

GeoJSON

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Fossils

Contains foraminifera - Plectostaffella seslavica (Rum.), Semistaffella mira (Raus.), Ozawainella aurora G. et L.; brachiopods Choristites bisulcatiformis Sem., C. pseudobisulcatiformis Rot., Phricodothyris asiatica Chao.

Age

Middle Carboniferous (Lower Bashkirian)

Age Span:

Beginning stage:

Bashkirian

Fraction up in beginning stage:

0.3

Beginning date (Ma):

320.93

Ending stage:

Bashkirian

Fraction up in the ending stage:

0.5

Ending date (Ma):

319.28

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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