Home Multi-Country Search About Admin Login
Cenozoic
Mesozoic
Late Paleozoic
Early Paleozoic
Neoproterozoic


Information provided by geoscience team at Ahmadu Bello University, Zaria, Nigeria --see About

Search by
Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple
Les Series Ouallen Formation
Click to display on map of the Ancient World at:
Les Series Ouallen Fm base reconstruction

Les Series Ouallen Fm

Period: 
Cambrian

Age Interval: 
Fortunian.


Province: 
Ahnet Basin

Type Locality and Naming

SW Algeria.

Synonym: Les Séries Ouallen Fm

References: Peron et al., 2018, 2019


Lithology and Thickness

Conglomerate. The top is featured by fluvial sandstones facies (Peron et al., 2019). Equivalent to Les Series Pourpree of the Mouydir Basin.


Lithology Pattern: 
Aus conglomerate


Relationships and Distribution

Lower contact

It transgressively overlies the Basement Complex.

Upper contact

It is unconformably overlain by the Les Gres Des Ajjers Fm.

Regional extent

Ahnet Basin of SW Algeria. 75,000 Km2


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[2.24,26.77],[2.5,26.91],[2.65,26.59],[2.84,27],[3.1,26.63],[3.46,26.4],[3.36,26.28],[3.58,25.55],[3.54,24.93],[3.6,24.34],[3.47,24.34],[3.23,24.68],[3.03,24.61],[3.17,23.93],[2.64,23.73],[2.38,23.94],[2.04,24.46],[1.92,25.72],[1.57,26.6],[1.63,27.17],[1.84,27.18],[1.84,27],[2.24,26.77]]]]}}

Fossils


Age 


Age Span: 

    Beginning stage: 
Fortunian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
538.80

    Ending stage: 
Fortunian

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
531.94

Depositional setting

Fluvial


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.