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Argilles d’Adrar Morrat Formation
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Argilles d’Adrar Morrat Fm base reconstruction

Argilles d’Adrar Morrat Fm

Period: 
Devonian

Age Interval: 
Eifelian


Province: 
Reggane Basin

Type Locality and Naming

SW Algeria. It is well exposed at Ain Inhanas, and at the Foum Belrem Ridge, Kahla in the northeast to Hassi Kermas (Wendt et al., 2006).

Synonym:

References:


Lithology and Thickness

It contains well-rounded, locally imbricated, pebbles of Lower Devonian sandstones, ironstones, phosphorites and corroded quartz grains in a calcareous matrix with brachiopod coquinas, and caps an eroded surface with an up to 1 m relief. The major part of the Eifelian consists of silty greenish shales with some thin interlayers of fine-grained sandstones and calcareous mudstones (Wendt et al., 2006). The thickness of the Eifelian strata (Argiles de l'Adrar Morrat Fm) varies considerably between 0–5 m on the Foum Belrem Ridge and 140 m in the eastern Reggane Basin (Wendt et al., 2006).


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

It unconformably overlies the Dkhissa Fm.

Upper contact

It is conformably overlain by the Calcaire de Azzel Matti Fm (Reggane Basin) or the Calcaire de Takoula Fm (Ahnet Basin)

Regional extent

SW Algeria. 75,000 Km2


GeoJSON

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Fossils


Age 


Age Span: 

    Beginning stage: 
Eifelian

    Fraction up in beginning stage: 
0.2

    Beginning date (Ma): 
392.50

    Ending stage: 
Eifelian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
385.30

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.