Calcaire Marnes Fm
Period:
Cretaceous
Age Interval:
Campanian - Maastrichtian.
Province:
Illizi Basin
Type Locality and Naming
Informal name based on the average lithology
Synonym: Marly limestone Fm (translation of the French)
References: Klett, 2000; Benvegnù, 2020.
Lithology and Thickness
The Calcaire Marnes Fm. is made up of limestones, dolostones, marl, and mudstones. It is the lateral equivalent of the top of Al Hamra Gr. of the Ghadames and Triassic (or Oued Mya) Basins (Klett, 2000).
Lithology Pattern:
Dolomitic limestone
Relationships and Distribution
Lower contact
It conformably overlies the Argile Gypse Fm.
Upper contact
-NA- Basin surface (at least on the chart)
Regional extent
Illize Basin of SE Algeria
GeoJSON
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Fossils
Age
Probably mid-Campanian through Maastrichtian (drawn as upper half of “Senonian” on column of Klett, 2000)
Age Span:
Beginning stage:
Campanian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
77.91
Ending stage:
Maastrichtian
Fraction up in the ending stage:
1.0
Ending date (Ma):
66.04
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: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 An unpublished MSc thesis at Universita’ degli Studi di Padova.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.