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Gres de Kreb ed Douro Formation
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Gres de Kreb ed Douro Fm base reconstruction

Gres de Kreb ed Douro Fm

Period: 
Carboniferous

Age Interval: 
Visean


Province: 
Reggane Basin, Mouydir Basin, Ahnet Basin

Type Locality and Naming

SW Algeria. The type locality and type section in Kreb ed Douro anticline where it is about 200m thick (Wendt et al., 2008). Named after the sandstone facies (“Grès).

Synonym: Grès de Kreb ed Douro Fm; Kreb ed Douro Sandstone; Kreb ed Douro Fm

References: Wendt et al., 2008; Perron et al., 2018


Lithology and Thickness

The formation is about 0–220m thick, and consists of cyclic (shallowing up) shale-siltstone-sandstone alternations with cross-bedding and poor brachiopod faunas in the sandstone members. The formation is thickest in the central and northern Ahnet where it attains 220 m at Tirechchoumine, 160 m at Jebel Berga, and 150 m at Jebel Mouima (Wendt et al., 2008; Perron et al., 2018).


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

It conformably overlies the Lower Tirechoumine Fm (or the Iridets Fm in the Mouydir Basin.)

Upper contact

It is conformably overlain by the Upper Tirechoumine Fm.

Regional extent

SW Algeria. 75,000 Km2


GeoJSON

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Fossils

Brachiopods.


Age 


Age Span: 

    Beginning stage: 
Visean

    Fraction up in beginning stage: 
0.1

    Beginning date (Ma): 
345.09

    Ending stage: 
Visean

    Fraction up in the ending stage: 
0.3

    Ending date (Ma):  
341.81

Depositional setting

Fluvial, to pelagic open-marine, and prodelta environment (Wendt et al., 2008).


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.