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Kerb Es Sefiat Formation
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Kerb Es Sefiat Fm base reconstruction

Kerb Es Sefiat Fm

Period: 
Carboniferous

Age Interval: 
Early – Middle Visean


Province: 
Tindouf Basin

Type Locality and Naming

Djebilet-Yetti subbasin (exposed on northwest margin of Tindouf Basin)

Synonym:

References: Guerrak, 1989

[Fig. 1: Geological map of the Tindouf Basin region. (from Guerrak, 1989).]

[Fig. 2: Location of the Tindouf Basin Province, North Africa, and the six assessment units (AUs) (USGS, 2019).]

[Fig. 3: Stratigraphic column of the Tindouf Basin region (Guerrak, 1989).]

[Fig. 4: Stratigraphic correlation of the northern and southern flanks of the Tindouf Basin (Guerrak, 1989).]

[Fig. 5: Stratigraphic column of the study area (redrawn after Guerrak, 1988a).]


Lithology and Thickness

The Kerb Es Sefiat Fm is about 300m thick, and is made up of shales and limestones (Guerrak, 1989).


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Conformably overlies the Kerb Es Slouguia Fm.

Upper contact

Conformably underlies the Ain El Barka Fm.

Regional extent

Extends throughout southern flanks of the Tindouf Basin, and Djebilet-Yetti subbasin (exposed on northwest margin of Tindouf Basin)


GeoJSON

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Fossils


Age 

Early – Middle Visean

Age Span: 

    Beginning stage: 
Visean

    Fraction up in beginning stage: 
0.00

    Beginning date (Ma): 
346.73

    Ending stage: 
Visean

    Fraction up in the ending stage: 
0.33

    Ending date (Ma):  
341.32

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:

Andrea Ciampalini, Francesca Garfagnoli, Benedetta Antonielli, Chiara Del Ventisette & Sandro Moretti (2012) Photo-lithological map of the southern flank of the Tindouf Basin (Western Sahara), Journal of Maps, 8:4, 453-464, DOI: 10.1080/17445647.2012.746947

Guerrak S. (1989): Time and space distribution of Palaeozoic oolitic ironstones in the Tindouf Basin, Algerian Sahara. In: Young, T. P. & Taylor, W. E. G. (eds), 1989: Phanerozoic Ironstones

Geological Society Special Publication 46, pp. 197-212

Guerrak S. (1988a): Geology of the Early Devonian oolitic iron ore of the Gara Djebilet field. Saharan Platform, Algeria. Ore Geology Reviews, (In Press).