Aristantau Formation

Aristantau Fm

Period:

Devonian

Age Interval:

Givetian, K8

Province:
Kyzylkum Region

Type Locality and Naming

In the Aristantau Mountains, Central Kyzylkum. A.K. Bukharin et al., 1982; (460, p.124)

Synonym: Aristantauskaya Suite, Аристантауская св.

Lithology and Thickness

Divided into two sub-suites: Lower (thickness 160m) dolomites with lenses and streaks of black cherts, with layers of limestones and lenses of limestone conglomerates, dolomitic limestones. Upper (thickness 440m) - limestones with layers of dolomites. Total thickness 600m.

Lithology Pattern:

Dolomitic limestone

Relationships and Distribution

Lower contact

Lower contact is conformable with Eifelian deposits

Upper contact

Upper - conformable with the Aristantau-Central Fm.

Regional extent

Central Kyzylkum, Aristantau Mountains. Aristantau Fm corresponds in Aristantau to the upper part of the Ayakkuduk Fm and Beshashik Fm; in Muruntau - to the middle and upper parts of the Auliekudzhumdin Fm. (495).

GeoJSON

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Fossils

Contains stromatoporoids - *Intexodictyon tschussovense* Yavor., *Trupetostroma">Trupetostroma* sp., *Stromatopora undata* Riab., tabulates - *Thamnopora* sp. ind.; acritarchs - *Leiosphaeridium* sp., *Baltisphaeridium* sp., *Lophesphaeridium* sp., *Cymatiesphaera* sp., and others; corals *Embolophyllum* sp. ind., *Bullatella* sp., *Pachycanalicula* sp. (ex gr. *dentata* Miron.); brachiopods - *Stringacephalus burtini* Defr. and others.

Age

Belongs to the Eifelian stage of the middle Devonian. On the geological map by Ya.B. Aysanov et al. (1986) and the State Geol. Map-500 of Uzbekistan (460) - Eifelian stage of the middle Devonian. On the geological map of the Kyzylkum Geodynamic Polygon (1993), it is accepted within the Eifelian-Eifelian stage of the middle Devonian. Since Aristantau Fm corresponds in Aristantau to the upper part of the Ayakkuduk Fm and Beshashik Fm; in Muruntau, it is put as Givetian in Lexicon

Age Span:

Beginning stage:

Givetian

Fraction up in beginning stage:

0.25

Beginning date (Ma):

383.70

Ending stage:

Givetian

Fraction up in the ending stage:

1.0

Ending date (Ma):

378.90

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)”