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Gres de Garet Dehb Formation
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Gres de Garet Dehb Fm base reconstruction

Gres de Garet Dehb Fm

Period: 
Carboniferous

Age Interval: 
Visean – Serpukhovian


Province: 
Reggane Basin, Ahnet Basin, Mouydir Basin

Type Locality and Naming

SW Algeria. Grés = sandstone. Named after the type location of Garet Dehb SSW of Jebel Moumina (Wendt et al., 2008).

Synonym: Grès de Garet Dehb Fm, Garet Dehb Sandstone Fm, Garet Dehb Fm

References: Wendt et al., 2008;


Lithology and Thickness

The Gres de Garet Dehb attains a thickness of over 300 m and show typical fluvial channels. They consist of mostly thin-bedded sandstones with cross-lamination and more easily erodible shale and siltstone intercalations. The sandstones are distinguished by current- and oscillation-ripples, bioturbation, and common bioclastic intercalations (Wendt et al., 2008).


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

It rests conformably on the Upper Tirechoumine Fm.

Upper contact

It is conformably overlain by the Calcaires du Djebel Berga Fm.

Regional extent

SW Algeria. 75,000 Km2


GeoJSON

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Fossils

crinoids, brachiopods, bryozoans, molluscs, land plants (Lepidodendropsis spp., Archaeocalamites spp., Stigmaria spp.)


Age 

uppermost Visean through mid-Serpukhovian

Age Span: 

    Beginning stage: 
Visean

    Fraction up in beginning stage: 
0.95

    Beginning date (Ma): 
331.16

    Ending stage: 
Serpukhovian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
326.87

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Enam O. Obiosio, Solomon Joshua Avong and Henry Nasir Suleiman (2024) - Stratigraphic Lexicon compiled from the following books:

Wendt J., Kaufmann B., Belka Z., Korn D (2008): Carboniferous Stratigraphy and Depositional Environments in the Ahnet Mouydir Area (Algerian Sahara). In: Facies. DOI 10.1007/s10347-008-0176-y

Wendt J., Kaufmann B., Belka Z., Klug C. & Lubeseder S. (2006): Sedimentary evolution of a Palaeozoic basin and ridge system: the Middle and Upper Devonian of the Ahnet and Mouydir (Algerian Sahara). Geol. Mag. 143 (3) pp. 269–299. doi:10.1017/S0016756806001737

Derder M, E.M., Henry B., Amenna M., Bayou B., Djellit H., Guemache M. A., Hemmi A. (2009): New structural implications for the central Sahara (Algeria), from the revisited Upper Carboniferous “Hassi Bachir” Formation: Paleomagnetic constraints. Tectonophysics, 463: pp.69–76.

Perron P., Guiraud M., Vennin E., Moretti I., Portier E., L. Le Pourhiet, M. Konaté (2018): Influence of basement heterogeneity on the architecture of low subsidence rate Paleozoic intracratonic basins (Reggane, Ahnet, Mouydir and Illizi basins, Hoggar Massif). Solid Earth, 9: pp.1239-1275.