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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Galhama Formation

Galhama Fm

Period:

Cretaceous, Paleogene

Age Interval:

Upper Cretaceous to Paleogene (Maastrichtian to Paleocene) (7c)

Province:
East Niger Rift Basin - Termit Sub-basin

Type Locality and Naming

Faure, 1954.

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

Synonym: Ghalama (misspelling); Série de Galhama.

Lithology and Thickness

Fine sandstones with cross-bedded stratifications. Continental alteration of the upper levels below the erosion surface has given rise to bauxites (20 m thick). From top to bottom, the following can be observed: gibbsite, kaolinite, and iron oxides. These can be concentrated at different levels up to 80 m below the paleosurface. Thickness is 10-35 m (Faure et al., 1966, pages 290-295).

Lithology Pattern:

Fine-grained sandstone

Relationships and Distribution

Lower contact

Underlain by the Agadem Fm

Upper contact

Unconformably overlain by the Homodji Fm

Regional extent

East Niger Rift Basin - Termit Sub-basin - East

GeoJSON

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Fossils

The top also displays continental deposits with plant debris in addition to bauxite.

Age

Upper Cretaceous to Paleogene (Maastrichtian to Paleocene)

Age Span:

Beginning stage:

Maastrichtian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

72.17

Ending stage:

Thanetian

Fraction up in the ending stage:

1.0

Ending date (Ma):

56.00

Depositional setting

Continental

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)