Garashkuduk Formation

Garashkuduk Fm

Period:

Carboniferous

Age Interval:

Lower Moscovian, K8

Province:
Kyzylkum Region

Type Locality and Naming

Along the Garashkuduk, Sangruntau Mountains, Central Kyzylkum. K.K. Pyatkov et al. (1961) described carbonate deposits; A.K. Bukharin et al. (1984) gave the name and assigned them the status of a suite.

Synonym:

Lithology and Thickness

At the base - a package of sandstones, siltstone (aleurolites), and argillites with olistoliths of limestones containing Serpukhovian-Early Bashkirian fauna. Above, conglomerates, aphinitic limestones, organogenic-detrital, from medium- to massive-bedded. Thickness 150 m.

Lithology Pattern:

Sandstone

Relationships and Distribution

Lower contact

Contacts are tectonic.

Upper contact

Contacts are tectonic.

Regional extent

Central Kyzylkum, fragmentarily along the northern slope of the Sangruntau Mountains.

GeoJSON

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Fossils

Contains Goniatites - Ramosites sp., Prolecanitidae, Baschkirites sp. and others, brachiopods - Pseudoleptaena disteria Gow., Rhipidomella sp., Striatifera striata (Fisch.), Linoproductus sp.; tabulates - Chaetetes">Chaetetes heritschi Sok., C. cf. bosvelly Sok.; foraminifers - Eostaffella sp., Climacammina sp., Endothyra ex gr. spirilliniferae Br. et Pot. and others, rugosans - Gereinophyllum sp. Z.C.P. Rumyantseva (386) discovered a complex of Lower Moscovian foraminifers, similar to those in the Adzhriktin Fm.

Age

Along the data of A.K. Bukharin et al. (1990), the age of the suite is dated within the Early Carboniferous Visean epoch - Middle Carboniferous Early Bashkirian based on the presence of a diverse fauna in the limestones from Late Visean to Early Bashkirian inclusive. Yu.S. Savchuk et al. (1993) believe that the limestones with Visean-Serpukhovian fauna are olistoliths, in the cement of which Middle Carboniferous foraminifers and algae of the middle Moscovian epoch are found. It belongs to the horizons of the Moscovian stage.

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.3

Beginning date (Ma):

312.71

Ending stage:

Moscovian

Fraction up in the ending stage:

1.0

Ending date (Ma):

307.02

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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