Dzhetyimtau Formation

Dzhetyimtau Fm

Period:

Devonian

Age Interval:

Givetian, K2

Province:
Kyzylkum Region

Type Locality and Naming

Along the Jetymtau Mountains, Central Kyzylkum. Ya.B. Aysanov et al., 1984.

Synonym: Dzhetymtayuskaya Suite, Джетыимтауская св.

Lithology and Thickness

Organogenic pelitomorphic limestones with interlayers of dolomites, argillites, and calcareous siltstone (aleurolites). Thickness up to 150 m.

Lithology Pattern:

Reef limestone

Relationships and Distribution

Lower contact

Conformably overlies the Irlyr Fm

Upper contact

Conformably overlain by the Oguztau Fm

Regional extent

Central Kyzylkum, middle part of the southern slope of the Irlyr carbonate ridge; Jetymtau Mountains.

GeoJSON

null

Fossils

Contains stromatoporoids - Amphipora cf. kirgisika Lach., A. ex gr. intexta Yavor., A cf. ramosiensis Bog., A. ex gr. ramosa Phill., Stachyodes sp. (ex gr. singularis Yavor.) and others, tabulates - Favosites rhenama Frech. and others; foraminifers - Avroria cf. singularis Pojark., Parathurammina sp., brachiopods - Stringocephalus sp.,

Age

Stromatoporoids characterizes the Givetian age (Middle Devonian) of the enclosing rocks. On the State Geologic Map-500 of Uzbekistan (460) it is assigned to the Lower-Middle Devonian.

Age Span:

Beginning stage:

Givetian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

385.30

Ending stage:

Givetian

Fraction up in the ending stage:

1.0

Ending date (Ma):

378.90

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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