Belikuduk Formation

Belikuduk Fm

Period:

Devonian

Age Interval:

Upper Devonian, K6

Province:
Kyzylkum Region

Type Locality and Naming

Along the Belikuduk column, Muruntau Mountains, Central Kyzylkum. E.V. Malova, 1963 (266, p.46; 441, p.66). Stratotype in the central part of the Muruntau Mountains.

Synonym: Belikuduk Suite, Беликудукская св.

Lithology and Thickness

Divided into two subzones.

Upper (thickness 104m) - dark gray, gray, nodular and aphinitic, medium- to thick-bedded limestones.

Lower (thickness 278m) - rhythmically interbedded organogenic-detrital dark gray to black, thin- and medium-bedded, banded, clayey limestones, calcareous siltstone (aleurolites) of yellowish-green to reddish-brown color, layered dark gray dolomites.

Total thickness of the suite is 382m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Conformably overlies the Auliekudzhumdin Fm

Upper contact

Conformably overlain by the Aznek Fm.

Regional extent

Central Kyzylkum, Tamdytau and Sangruntau Mountains. It is an analogue of the Central Aristantau Fm and Dzhanakhmet Fm (Janahmetian Fm) in the Aristantaus Mountains. (460).

GeoJSON

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Fossils

Upper – Containing individual recrystallized amphiporoids, foraminifers (495) and conodonts Polygnathus decorosus Stauf., allowing to refer the upper subzone to the Famennian (165).

Lower – Contains stromatoporoids - Actinostroma">Actinostroma nicholsoni Yavor., Trupetostroma">Trupetostroma bassleri Lec., Amphipora rudis Lec. and others; brachiopods - Theodossia anossofi Vern., Gypidula sp.; foraminifers - Bisphaera irregularis Bir., Tuberitina maljavkini Mikh. and others, characterizing the Frasnian stage.

Age

Refers the upper subzone to the Famennian (165). Lower to the Frasnian stage.

Age Span:

Beginning stage:

Frasnian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

378.90

Ending stage:

Famennian

Fraction up in the ending stage:

1.0

Ending date (Ma):

359.30

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)”