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Calcaires du Djebel Berga Formation
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Calcaires du Djebel Berga Fm base reconstruction

Calcaires du Djebel Berga Fm

Period: 
Carboniferous

Age Interval: 
Serpukhovian - Bashkirian


Province: 
Reggane Basin, Ahnet Basin

Type Locality and Naming

SW Algeria. E flank of Jebel Berga syncline

Synonym: Once named In R’ar Fm (Wendt et al., 2008). Djebei Berga Fm, Djebei Berga Limestone.

References: Conrad, 1973; Wendt et al., 2008; Derder et al., 2009; Peron et al., 2018


Lithology and Thickness

The Calcaires du Djebel Bega Fm is about 350m thick and is made up of marine limestones. Its base is an alternation of sandstones and limestones, which are overlain by massive calcareous bed containing brachiopods and polyparies, with levels of fine sandstones and claystones (Conrad, 1973; Derder et al., 2009).


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

It conformably overlies the Gres de Garet Dehb Fm

Upper contact

It is conformably overlain by the Hassi Bachir Fm. in the Reggane Basin, and conformably overlain by the Gypses d’Hassi Taibine Fm. in the Ahnet Basin.

Regional extent

SW Algeria. 75,000 Km2


GeoJSON

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Fossils

Conodonts,


Age 

upper Serpukhovian to Bashkirian in Reggane Basin (used here); but only early Baskirian in Ahnet Basin (but underlying unit is not exposed)

Age Span: 

    Beginning stage: 
Serpukhovian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
326.87

    Ending stage: 
Bashkirian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
315.15

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.