Auliekudzhumdin Formation

Auliekudzhumdin Fm

Period:

Devonian

Age Interval:

Middle Devonian, Eifelian-Givetian, K6

Province:
Kyzylkum Region

Type Locality and Naming

Along Auliekudzhumdy, southern Tamdytau, Central Kyzylkum. P.N. Podkopaev et al., 1966.

Synonym: Auzikudzhumdin Suite, Аулиекуджумдинская св.

Lithology and Thickness

Thin-bedded dark gray organogenic limestones with layers of reddish clay varieties, horizons of organogenic limestones of reef origin, often brecciated; sometimes replaced by massive dolomites. Thickness 300-500m.

In Sangruntau, the Auliekudzhumdin Fm includes thin-bedded, marbled, banded limestones with rare crinoids. Thickness 300m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Lower boundary stratigraphically conformable with the South Bozdon Fm

Upper contact

Upper - conformable with the Belikuduk Fm.

Regional extent

Central Kyzylkum, Tamdytau Mountains, Sangruntau.

GeoJSON

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Fossils

Brachiopods - Stringocephalus burtini Defr. and others; corals - Scoliopora sp., Chaetetidae and others; stromatoporoids - Actinostroma">Actinostroma klathratum Nich., Stachyodes sp.; conodonts - Polygnathus kimi Mash., P. costatus costatus Klap., P. angusticostatus Wit.

Age

Middle Devonian age in the Eifelian-Givetian interval is determined by brachiopods. Middle Devonian age is established by lithological and stratigraphic analogy with faunally characterized sections of the Auliekudzhumdin Fm in South Tamdytau and by conformable overlying by limestones of the Upper Devonian (Bukharin et al., 1990). N.V. Cherkashenko et al. (495) and in the monograph (165) accept the Auliekudzhumdin Fm in the volume of the Eifelian and Givetian stages, consider it an age analogue of the Ayakkuduk Fm and Beshashik Fm. Aristanta. On the State Geolmap-500 of Uzbekistan (460) it is accepted in the volume of the Givetian of the Middle Devonian.

Age Span:

Beginning stage:

Eifelian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

389.80

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