Dollé Fm
Period:
Paleogene
Age Interval:
Paleogene (Oligocene) (7a)
Province:
East Niger Rift Basin - Termit Sub-basin
Type Locality and Naming
Termit Massif (Fig. 1).
[Figure 1: Section of the Dollé Fm at the Termit Massif (Source: Faure, 1966)]
References: Faure, 1966; Petters, 1981; Fabre et al., 1983.
Synonym: Dolle Fm; Equivalent(s): Homodji Fm and Zaouzaoua Fm in Niger.
Lithology and Thickness
Coarse conglomerate sandstones, clayey sandstones, sandy kaolinitic clays and isolated oolitic shaly sandstone beds. Its thickness is about 120 m. Oolitic beds can be more than 20 m thick.
Lithology Pattern:
Relationships and Distribution
Lower contact
In discordance onto the Termit Fm.
Upper contact
Overlain by the Chad Fm
Regional extent
East Niger Rift Basin - Termit Sub-Basin - West
GeoJSON
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Fossils
Plant imprints.
Age
Paleogene (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)