Edjeleh Fm
Period:
Ordovician
Age Interval:
Dapingian – Darriwilian.
Province:
Illizi Basin
Type Locality and Naming
Synonym: Melez Chograne Fm and basal Jefarah Fm. in Ghadames Basin; Unit III-3 in Illizi Basin (Benvegnù, 2020).
References: Hallett, 2002; Jabir et al., 2020; Benvegnù, 2020
Lithology and Thickness
It is made up of marine shales with interbedded sandstone, representing a flooding event (Jabir et al., 2020). There is evidence of subaqueous slumps, liquefaction and turbidity flows and brachiopods are present, thus indicating a cold water environment; that’s the reason why the Edjeleh Fm. represents a first major deglaciation event (Hallett, 2002).
Lithology Pattern:
Sandy claystone
Relationships and Distribution
Lower contact
It unconformably overlies the Hamra Fm.
Upper contact
It is conformably overlain by the Gara Louki Fm.
Regional extent
Illize Basin of SE Algeria
GeoJSON
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Fossils
Brachiopods.
Age
Middle Ordovician
Age Span:
Beginning stage:
Dapingian
Fraction up in beginning stage:
0.00
Beginning date (Ma):
471.26
Ending stage:
Darriwilian
Fraction up in the ending stage:
1.0
Ending date (Ma):
458.18
Depositional setting
Marine (Benvegnù, 2020).
Depositional pattern:
Additional Information
Compiler:
Enam O. Obiosio, Solomon Joshua Avong and Henry Nasir Suleiman (2024) - Stratigraphic Lexicon compiled from the following books:Benvegnù I. (2020): Thermal Evolution of Paleozoic and Triassic Reservoir Rocks in the Ghadames-Illizi Basin (Algeria). An unpublished MSc thesis at Universita’ degli Studi di Padova.
T.R. Klett (2000): Province, Algeria, Tunisia, and Libya - The Tanezzuft-Oued Mya, Tanezzuft-Melrhir, and Tanezzuft-Ghadames. U.S. Geological Survey Bulletin, 2202-C.