Carb-F Formation

Carb-F Fm

Period:

Carboniferous

Age Interval:

(?)Moscovian – Gzhelian.

Province:
Illizi Basin

Type Locality and Naming

“Carboniferous formations are divided into members, each having a code from A to F, with A being the oldest and F the youngest” (USGS-Klett, 2000, summary). [NOTE: For clarity and to separate from the “F2” etc. set of Devonian, then the prefix “Carb-“ is added to this Lexicon.]

Synonym: F member

References: Benvegnù, 2020

Lithology and Thickness

It is made up of carbonates and evaporites deposition with intercalated sandstones, divided into two members: the lower member is made up of gypsiferous claystone with beds of limestone, marl and calcarenite while the upper one comprises dolostones, limestones and calcarenites (Benvegnù, 2020).

Lithology Pattern:

Dolomitic limestone

Relationships and Distribution

Lower contact

It conformably overlies the Carb-D-E Fm.

Upper contact

It is unconformably overlain by the Zarzaitine Inferieur Fm. Entire Permian is absent.

Regional extent

Illize Basin of SE Algeria

GeoJSON

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Fossils

Brachiopods and Fusulinid foraminifera

Age

Late Carboniferous

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.00

Beginning date (Ma):

315.15

Ending stage:

Gzhelian

Fraction up in the ending stage:

1.0

Ending date (Ma):

298.89

Depositional setting

Shallow marine (Benvegnù, 2020)

Depositional pattern:

Additional Information

: The Dembaba Fm. represents an oil and gas reservoir (Shaltami et al., 2019).

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 An unpublished MSc thesis at Universita’ degli Studi di Padova.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.