Homodji Fm
Period:
Paleogene
Age Interval:
Oligocene (7c)
Province:
East Niger Rift Basin - Termit Sub-basin
Type Locality and Naming
References: Faure, 1954, 1966; Massa & Collomb, 1960; Faure et al., 1956; Fabre et al., 1983.
Synonym: Homudji (misspelling), Série d’Homodji
Lithology and Thickness
Deposited after a continental alteration phase (bauxite) on the Galhama formation, this argillaceous, sandy formation with kaolinite and iron oxides comprises three units which are, from bottom to top: 3. Lower unit of micaceous siltstones with ferruginous beds; 2. Coarse-grained sandstones locally silicified 1. Upper unit of an alternation of coarse clayey sandstones and ferruginous oolite. 20-50 m thick.
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
Unconformably underlain by the Galhama Fm
Upper contact
Overlain by the Chad Fm or None
Regional extent
East Niger Rift Basin - Termit Sub-basin - East
GeoJSON
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Fossils
Age
Oligocene
Age Span:
Beginning stage:
Rupelian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
33.90
Ending stage:
Chattian
Fraction up in the ending stage:
1.0
Ending date (Ma):
23.04
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)