Kipchak Formation

Kipchak Fm

Period:

Paleogene

Age Interval:

upper Paleocene (Thanetian), U5

Province:
Ustyurt-Sultanuzdag

Type Locality and Naming

By the village of Kipchak, Pre-Aral. A.A. Abdusamatov, A.G. Kutepev, 1995f. Stratotype in the eastern foothills of the Sultanuizdag Range (Karachadalyssay).

Synonym: Kipchak Suite, Кипчакская св.

Lithology and Thickness

In the stratotype, the suite is represented by:

1. Loose oyster beds consisting of numerous thin-walled oyster shells of medium size. The filler is loose clayey sand of yellow-gray color, quartz-feldspar-mica composition. At the base of the oyster bed, phosphoritized pebbles (I phosphorite horizon) of dark brown, black color, rounded. Thickness up to 2 m.

2. Phosphorites (II phosphorite horizon), Thickness 0.4 m.

3. Clayey yellowish-green sands, fine-grained, quartz-feldspar-mica. Thickness up to 1.5 m.

Maximum thickness of the suite 10 m.

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

Lies conformably on the dat+monta limestones (Karachadalyssay) or with erosion on various horizons of the Upper Cretaceous. Schematic stratigraphic column indicates the lower contact as Beshtobin Fm

Upper contact

It is overlain conformably by the Sugralin Fm.

Regional extent

Pre-Aral, foothills of the Sultanuizdag Range. Correlated with the Kazakhtau Fm of the Kyzylkum (Abdusamatov et al., 1995f.).

GeoJSON

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Fossils

In the stratotype, the suite contains marine bivalve mollusks - Pycnodonta camelus extensa (Vial.), Ostrea bellovacina chivensis Burač., P. antiqua (Schwetz.), P. antiqua sartaganica Vial.

Age

Belongs to the Upper Paleocene, Thanetian stage. Used in the legend of the Pre-Aral subseries for geological maps of the Sultanuizdag Range at a scale of 1:200000.

Age Span:

Beginning stage:

Thanetian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

59.24

Ending stage:

Thanetian

Fraction up in the ending stage:

1.0

Ending date (Ma):

56.00

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)”