East Aristanau Reef Formation

East Aristanau Reef Fm

Period:

Devonian

Age Interval:

Pragian–lowermost Givetian, K8

Province:
Kyzylkum Region

Type Locality and Naming

Along the Aristatau Mountains, Central Kyzylkum. N.V. Cherkashenko, N.M. Larin et al., 1989 (495, p.42)

Synonym: East Aristantau Topsya, Восточноаристантауская т.

Lithology and Thickness

A mighty reefogenic layer of limestones. Thickness 1000m.

Lithology Pattern:

Reef limestone

Relationships and Distribution

Lower contact

Relationships with underlying and overlying deposits are not established (165; 495).

Upper contact

Relationships with underlying and overlying deposits are not established (165; 495).

Regional extent

Kyzylkumy, eastern part of Aryanstantau.

GeoJSON

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Fossils

The lower part contains brachiopods - Ivdelinia pseudoivdelensis Khod., Sieberella sieberi Buch., Cymostrophia stephani Barr., characteristic of the Pragian level of the Lower Devonian. In the middle part, corals - Favosites sp. (ex gr. macrospinosus Dubat.); brachiopods - Megastrophia cf. uralensis Vern., Productella sp., Carinatina cf. arimaspa Eichw.; Tentaculites - Dicriconus sp., Striatostiliolina sp., conodonts Polygnathus inversus Klapp. et John., P. serotinus Telf. of Emsian age. In the upper part, stromatoporoids - Columnostroma ex gr. fenestratum Nich., Trupetostroma">Trupetostroma ex gr. tschernyschevi Yavor., brachiopods - Gypidula sp., Eospirifer ex gr. nobilis Barr., Atrypa ex gr. vulgaris Alekx., A. devoniana Webst.; conodonts - Polygnathus linguiformis Hinde., P. linguiformis betta Bult., determining the age interval from Eifelian to the lower part of the varcus zone of the Givetian.

Age

Spans Pragian–lowermost Givetian.

Age Span:

Beginning stage:

Pragian

Fraction up in beginning stage:

0.65

Beginning date (Ma):

411.17

Ending stage:

Givetian

Fraction up in the ending stage:

0.25

Ending date (Ma):

383.70

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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