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Calcaires de Azzel Matti Formation
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Calcaires de Azzel Matti Fm base reconstruction

Calcaires de Azzel Matti Fm

Period: 
Devonian.

Age Interval: 
Givetian.


Province: 
Reggane Basin

Type Locality and Naming

SW Algeria. Its Type Locality is at Gara Azel Matti, while the Type Section ia at Adrar Morat (Wendt et al., 2006).

Synonym:

References: Wendt et al., 2006.


Lithology and Thickness

The formation is about 2-45m thick, and consists of well-bedded limestone with shale intercalations, mud buildups, with dark, partly bituminous mudstones and wackestones which contain a great variety of skeletal remains (Wendt et al., 2006).


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

It conformably overlies the Argiles de l’Adrar Morrat Fm.

Upper contact

It is conformably overlain by the Argiles de Mehden Yahya 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

Goniatites, orthoconic nautiloids, gastropods, pelecypods, brachiopods, bryozoans, styliolinids, trilobites, crinoids, and solitary rugose corals.


Age 


Age Span: 

    Beginning stage: 
Givetian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
385.30

    Ending stage: 
Givetian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
378.90

Depositional setting

Shallow, open marine environment which passes laterally, with an insignificant relief, into basinal areas with prevailing shale sedimentation (Wendt et al., 2006).


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.