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Les Gres de Ouargla Formation
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Les Gres de Ouargla Fm base reconstruction

Les Gres de Ouargla Fm

Period: 
Ordovician

Age Interval: 
Floian-Dapingian


Province: 
Ahnet Basin, Mouydir Basin

Type Locality and Naming

Synonym: Les Grès de Ouargla Fm

References: Peron et al., 2018, 2019


Lithology and Thickness

Les Gres de Ouargla Fm is made up of shaley sandstones, and it is the lateral equivalent of the upper Les Gres Fm of the Reggane Basin (see Fig.3 of Perron et al., 2019).


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

It unconformably overlies the Quartzites de Hamra Fm.

Upper contact

It is unconformably overlain by the Les Argiles d’Azzel Tiferouine Fm.

Regional extent

SW Algeria, 75,000 Km2


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[-0.96,26.84],[1.04,27.54],[2.69,28.22],[5,28.22],[5.81,27.21],[5.81,26.5],[5.13,25.47],[4.05,24.96],[3.51,24.55],[2.83,23.98],[2.29,23.89],[1.42,23.98],[0.66,25.06],[0.12,25.88],[-0.96,26.84]]]]}}

Fossils


Age 

Late Floian-Early Dapingian

Age Span: 

    Beginning stage: 
Floian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
474.17

    Ending stage: 
Dapingian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
470.34

Depositional setting

shoreface (Perron, 2019).


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.