East Aktau Formation

East Aktau Fm

Period:

Silurian, Devonian

Age Interval:

Upper Silurian-Lower Devonian, K5

Province:
Kyzylkum Region

Type Locality and Naming

By location east of the Aktau Mountains, S. Tamdytau, C. Kyzylkum. Identified by participants of the Stratigraphic Conference in the Muruntau Mountains in the fall of 1992 (Abduazimova et al., 1993). Exposed as a tectonic outlier in the area of the Dzhamankyngyr settlement (S. Tamdytau), known as "Ryvkin's Satellite".

Synonym: East Aktau Suite, Восточноактауская св.

Lithology and Thickness

Gray fine-grained, sometimes marly, layered dolomites, dolomitized limestones with rare layers of clayey slates. Thickness 120m.

Lithology Pattern:

Dolomite

Relationships and Distribution

Lower contact

Schematic stratigraphic column indicates lower contact as Koskuduk Fm

Upper contact

Schematic stratigraphic column indicates upper contact as Kyngyr Fm

Regional extent

GeoJSON

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Fossils

Contains tabulates - Favosites ex gr. humilis Sok., Syringopora aff. ferganensis Fom.; brachiopods - Lissatrypa linguata columbella Barr., Eoreticularia tschenychevi maltchensis Nikif. of the Isfara Mountains

Age

A.K. Bukharin et al. (1990) consider these deposits a klippe of the West Balpantau Fm of the Upper Silurian-Lower Devonian.

Age Span:

Beginning stage:

Lochkovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

419.00

Ending stage:

Lochkovian

Fraction up in the ending stage:

1.0

Ending date (Ma):

412.40

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)”