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Zemlet Formation
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Zemlet Fm base reconstruction

Zemlet Fm

Period: 
Devonian

Age Interval: 
Lochkovian


Province: 
Reggane Basin

Type Locality and Naming

SW Algeria.

Synonym:

References:

[Figure 1: Map showing the six assessment units (AUs) in the Reggane Basin Province, Algeria (USGS, 2018).]

[Figure 2: Paleozoic litho-stratigraphic, sequence stratigraphy, and tectonic framework of the north peri-Hoggar basins (North African Saharan Platform) (Perron et al., 2020).]

[Figure 3: Geodynamic synthesis and lithostratigraphy of the Central Sahara and the Ouagarta Chain with major tectonic events (Kracha, 2011).]

[Figure 4: Geographical map of the basins of North Africa – showing the Reggane Basin (Carte SONATRACH, Division Exploration, in Akkouche, 2007).]


Lithology and Thickness

The Zemlet Fm is made up entirely of sandstones (Peron et al., 2018).


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

It conformably overlies the Argiles de Oued Ali Fm.

Upper contact

It is conformably overlain by the Saheb El Djir Fm.

Regional extent

SW Algeria. 75,000 Km2


GeoJSON

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Fossils


Age 


Age Span: 

    Beginning stage: 
Lochkovian

    Fraction up in beginning stage: 
0.00

    Beginning date (Ma): 
419.00

    Ending stage: 
Lochkovian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
415.70

Depositional setting

continental/fluvial in the south, passing into deltaic/shallow marine sandstones with argillaceous intercalations towards the north and northwest (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.