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Hot Shales Formation
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Hot Shales Fm base reconstruction

Hot Shales Fm

Period: 
Silurian

Age Interval: 
Rhuddanian – Homerian.


Province: 
Ahnet Basin, Mouydir Basin

Type Locality and Naming

Term from downhole logging to due high organic content, hence higher Uranium and high (“hot”) gamma signature?

Synonym: It is also known as the Argiles de Tiounkeline Fm in the Ahnet Basin region, and Argiles a Graptolites Fm (Argiles à Graptolites Fm) in the Mouydir Basin region (see Fig. 3 of van Dijk et al., 2019).

References: van Dijk et al., 2019.


Lithology and Thickness

The Hot Shales Fm is made up of massive shales, and it is laterally equivalent to the lower part of Argiles de Oued Ali Fm. of the Reggane Basin (van Dijk et al., 2019).


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

It unconformably overlies the Felar Felar Fm (Ahnet Basin) or the M’Kratta El Golea Fm (Mouydir Basin)

Upper contact

It is conformably overlain by the Zone de Passage Fm.

Regional extent

75,000 Km2


GeoJSON

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Fossils


Age 


Age Span: 

    Beginning stage: 
Rhuddanian

    Fraction up in beginning stage: 
0.00

    Beginning date (Ma): 
443.07

    Ending stage: 
Homerian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
426.74

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.