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

Akbulak-Carb Formation

Akbulak-Carb Fm

Period:

Carboniferous

Age Interval:

Serpukhovian- Bashkirian, N5a

Province:
Nuratau

Type Locality and Naming

Along the Akbulak stream, Dzhalair Ridge, northern slope of the Turkestan Range. Z.S. Rumyantseva, 1973 (387, p. 77). Stratotype along the Akbulak stream near the spring.

Synonym: Akbulak Formation, Акбулакская св.

Lithology and Thickness

Spotted detrital-oncolitic, algal–foraminiferal limestones containing siliceous concretions and nodules. At the base of the formation, bauxites are locally developed with thickness from a few centimeters to 8–10 m, or a unit 4.5 m thick of reddish-brown gravelstones, sandstones, and siltstones. Total thickness: 40–85 m.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

It transgressively overlies the limestones of the Sulyuktin Fm

Upper contact

It is transgressively overlain by the limestones of the Ramazan Fm (165; 439).

Regional extent

Northern slope of the Turkestan Range, Dzhalair Ridge.

GeoJSON

null

Fossils

Contains foraminifera: Eostaffella jachakia Rum., E. angusta (Kir.), E. (Eostaffelina) protvae (Raus.), Millerella carbonica Grozd. and Leb., M. uralica Kir., Novella primitiva Raus., Pseudostaffella antiqua (Dutk.), P. cf. varsanofievae Raus., P. inconstans (Reitl.), Asteroarchaediscus ex gr. baschkiricus (Krest. and Theod.), and others.

Age

It is assigned to the Lower Bashkirian Substage of the Middle Carboniferous. Put as arbitrary 90% up in Serpukhovian to emphasize soil facies

Age Span:

Beginning stage:

Serpukhovian

Fraction up in beginning stage:

0.9

Beginning date (Ma):

324.09

Ending stage:

Bashkirian

Fraction up in the ending stage:

0.9

Ending date (Ma):

315.98

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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