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Hassi Bachir Formation
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Hassi Bachir Fm base reconstruction

Hassi Bachir Fm

Period: 
Carboniferous

Age Interval: 
Moscovian – Gzhelian


Province: 
Reggane Basin

Type Locality and Naming

SW Algeria. The Type Locality is Hassi el Bachir, while the Type Section is in SW flank of Jebel Berga syncline (Wendt et al., 2008).

References: Conrad, 1973; Derder et al., 2009


Lithology and Thickness

The Hassi Bachir Fm is about 250m thick, and is made up of red sandstones and claystones with ferruginous minerals, alternating with rare calcareous and dolomitic beds of marine or lacustrine origin (Conrad, 1973; Derder et al., 2009).


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

It conformably overlies the Calcaires du Djebel Berga Fm.

Upper contact

-NA- Basin Surface.

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


Age 

Moscovian to late Gzhelian. Average top is ca. 65% up in Gzhelian (diachronous; older to east)

Age Span: 

    Beginning stage: 
Moscovian

    Fraction up in beginning stage: 
0.00

    Beginning date (Ma): 
315.15

    Ending stage: 
Gzhelian

    Fraction up in the ending stage: 
0.65

    Ending date (Ma):  
300.57

Depositional setting

Continental, shallow marine, lacustrine (Derder et al., 2009).


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.