Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Paleozoic

Compiled by: Jacques LeBlanc (2022), Stratigraphic Lexicon: The Sedimentary Formations of The Republic of Niger, Africa. Colnes Publishing (Tallin, Estonia), 365 pp. For more information see "About"

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Agadem Formation

Agadem Fm

Period:

Cretaceous

Age Interval:

Coniacian-Campanian (7c)

Province:
East Niger Rift Basin - Termit Sub-basin

Type Locality and Naming

Massif of Agadem. Seen by G. Rohlfs in 1868, found in 1941 by Chief Warrant Officer Gobin, studied by R. Furon (1942) and Ph. Renault in 1954. Furon (1942), emend. Faure (1954, 1966).

References: Furon, 1942; Faure, 1954, 1966; Faure et al., 1956; Fabre et al., 1983.

Synonym: Série d’Agadem; Formation d’Agadem; Equivalent(s): Kafra Fm.

Lithology and Thickness

At the top, gypsum clays and fine sandstone, sometimes with glauconite; at the base, fine red or white sandstone, with cross-bedded stratifications with marine lamellibranchs. 100 m thickness.

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

Underlying unit is the Zoo Baba Fm

Upper contact

Overlying unit is the Galhama Fm

Regional extent

In the Dibella, Agadem, Bilma Regions

GeoJSON

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Fossils

Ammonites (Hoplitoides and Metengonoceras). Lamellibranchs such as Fragum subperobliquum ν. Koenen, Parmicorbula incurvata, etc. (Fig. 1)

[Figure 1: General disposition of the sedimentary formations in the Agadem Massif. Ŧ = Fossils. (Faure, 1966)]

Age

Coniacian-Campanian; Faure, 1966, pages 288 to 306

Age Span:

Beginning stage:

Coniacian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

89.39

Ending stage:

Campanian

Fraction up in the ending stage:

0.0

Ending date (Ma):

83.65

Depositional setting

Marine

Depositional pattern:

Additional Information

Compiler:

Jacques LeBlanc (2022), Stratigraphic Lexicon: The Sedimentary Formations of The Republic of Niger, Africa. Colnes Publishing (Tallin, Estonia), 365 pp. https://doi.org/10.47909/978-9916-9760-6-7 (or via https://sites.google.com/site/leblancjacques)