Okzhetpes Formation

Okzhetpes Fm

Period:

Devonian

Age Interval:

Middle-Upper Devonian, K3

Province:
Kyzylkum Region

Type Locality and Naming

In the Okzhetpes Mountains, Central Kyzylkum. A.A. Shapkin et al. (1974) described the Okzhetpes type section, Ya.B. Aysanov et al. (1984) assigned these deposits the status of a suite in the middle-upper Devonian.

Synonym:

Lithology and Thickness

Light gray, aphinitic limestones with thin lenticular layers of clayey varieties. Thickness: 490m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

Underlying strata are unknown

Upper contact

Conformably overlain by the limestones of the Dzhuskyuduk Fm (Aysanov et al., 1984).

Regional extent

Central Kyzylkum, Okzhetpes Mountains, core of the Okzhetpes brachy anticline.

GeoJSON

null

Fossils

Contains crinoids - Pentagonocyclicus radialis Yelt.; amphiporae - Amphipora ramosa Phill.; brachiopods - Stringocephalus burtini Defr. and others of the Givetian stage (Shapkin et al., 1974).

Age

Middle-late Devonian age is accepted based on organic remains and position below the Lower Carboniferous deposits.

Age Span:

Beginning stage:

Dapingian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

471.26

Ending stage:

Famennian

Fraction up in the ending stage:

1.0

Ending date (Ma):

359.30

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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