Sardar Formation

Sardar Fm

Period:

Carboniferous

Age Interval:

Middle-Upper Carboniferous, K3

Province:
Kyzylkum Region

Type Locality and Naming

By the col. Sardar, Okzhetpes city, Central Kyzylkum. Ya.B. Aysanov et al. in 1984 (460, p. 207).

Synonym: Sardar Suite, Сардарская св.

Lithology and Thickness

The section of the suite is divided into two parts.

Upper (thickness about 400m) - greenish-gray, gray polymictic and volcanomictic sandstones with low-power layers of gravels and siltstone (aleurolites),

Lower (thickness about 250 m) - gray and dark gray claystones (argillites) and siltstone (aleurolites) with layers of polymictic gravels and limestones;

Total thickness up to 650 m.

Lithology Pattern:

Sandstone

Relationships and Distribution

Lower contact

It lies with deep erosion on the Bostau Fm (Aysanov et al., 1986) or the Keriz Fm (460).

Upper contact

It is unconformably overlain by Cretaceous deposits (Shapkin et al., 1974).

Regional extent

Central Kyzylkum, Okzhetpes city.

GeoJSON

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Fossils

In the layers of limestones, brachiopods - Schizostoma marginatus Eichw., Productus sp. and others; pelecypods - Aviculopecten sp. and others

Age

Brachiopods are widespread in the Middle-Upper Carboniferous. On the geological map of the Kyzylkum geodynamic polygon (Savchuk et al., 1993) and by A.K. Bukharin et al. (1990), it is dated to the Middle Carboniferous; on the State Geol. Map-500 of Uzbekistan (460), it is assigned to the Middle-Upper Carboniferous.

Age Span:

Beginning stage:

Kasimovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

307.02

Ending stage:

Gzhelian

Fraction up in the ending stage:

1.0

Ending date (Ma):

298.89

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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