Kultaban Formation

Kultaban Fm

Period:

Paleogene

Age Interval:

Middle Eocene (Lutetian-Bartonian), K1-K9

Province:
Kyzylkum Region

Type Locality and Naming

Along the Kultaban ridge, Kyzylkum. R.K. Makarova, E.F. Tsatsir, 1966. Stratotype 7 km east of the village of Tamdykuduk. . Used in the preparation of reference legends, geological survey, exploration, and thematic works of the Kyzylkum, Nurata ore districts, Sultanuizdag Mountains, and Pre-Aral.

Synonym: Kultaban Suite, Культабанская св.

Lithology and Thickness

Greenish-gray, bluish-green, silty (aleuritic), carbonate clays in the lower and non-carbonate in the upper parts. Thickness up to 210m.

Lithology Pattern:

Continental marl

Relationships and Distribution

Lower contact

It lies conformably on the Sugralin Fm. The lower boundary is diachronous (see Sugralin Fm).

Upper contact

It is conformably overlain by the Maral Fm, or with erosion by the Sarbatyr-Paleog Fm, Neogene, or Quaternary formations.

Regional extent

South, Central and Western Kyzylkum, Western Pre-Aral region, Sultan-Uizdag,, north-west of the Bukhara depression, Zirabulak-Ziaetdin and Nurata districts.

GeoJSON

null

Fossils

In the lower and middle parts, it contains foraminifers - Anomalina venesuelana Nutt., Haplophragmoides orfaensis Rod., Trochammina masini Sub., Pseudohastigerina sharkriverensis (Berg. et Olss.), Acarinina rotundimarginata Subb., Uvigerina costellata Moroz.; marine bivalve mollusks - Nuculana santasica Jark., Bathyarca rubastschaica Korob., Marcia (Mercimonia) gasliensis Korob. et Makar. In the top, foraminifers - Hsianella vialovi N. Byk., Cribrononion rischtanicum N. Byk., marine bivalve mollusks - Lucina menardi Desh., Pitar nitida Desh., Ostrea simplex Desh.; nanoplankton zones NP 16-17 Discoaster bifax, D. Saipanensis.

Age

It belongs to the middle Eocene (Lutetian-Bartonian stage).

Age Span:

Beginning stage:

Bartonian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

41.03

Ending stage:

Bartonian

Fraction up in the ending stage:

1.0

Ending date (Ma):

37.71

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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