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Gres de Mehden Yahya Formation
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Gres de Mehden Yahya Fm base reconstruction

Gres de Mehden Yahya Fm

Period: 
Devonian.

Age Interval: 
Frasnian.


Province: 
Reggane Basin

Type Locality and Naming

SW Algeria. Its Type Locality is at Mehden Yahya (Yahia), while the Type Section is at Adrar Morat (Wendt et al., 2006).

Synonym: Gres de Mehden Yahia Fm

References: Wendt et al., 2006.


Lithology and Thickness

Thin-bedded, medium-grained, partly cross-bedded, brownish sandstones and clays. The thickness of this unit varies considerably, between 3 m and 120 m. (Wendt et al., 2006).


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

It conformably overlies the Argiles de Mehden Yahya Fm.

Upper contact

It is conformably overlain by the Temertasset Fm.

Regional extent

SW Algeria. 75,000 Km2


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[-1.45,28.19],[-0.93,27.72],[-0.45,27.58],[-0.3,27.2],[0.01,26.94],[-0.03,27.29],[0.06,27.33],[0.24,27.16],[0.79,26.34],[0.85,25.8],[1.06,25.9],[1.19,25.47],[1.48,24.33],[0.48,24.39],[-0.97,24.81],[-1.89,25.61],[-2.08,25.91],[-2.41,26.12],[-2.53,26.58],[-2.28,27.76],[-1.96,28.21],[-1.45,28.19]]]]}}

Fossils

Brachiopods and tentaculitids


Age 


Age Span: 

    Beginning stage: 
Frasnian

    Fraction up in beginning stage: 
0.65

    Beginning date (Ma): 
373.83

    Ending stage: 
Frasnian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
371.10

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.