Dallols Gr
Period:
Paleogene
Age Interval:
Late Paleocene (Danian) to Oligocene (1)
Province:
Iullemmeden Basin
Type Locality and Naming
Hanon (1984) and Dikouma (1990) include the upward succession of Garadaoua Fm, Ader-Doutchi Fm and Birni N'Konni Fm in the group (Fig. 1). Hanon (1990) includes only the Garadaoua and Ader-Doutchi formations. This lexicon opted to have the three formations as outlined by Dikouma (1990) and Hanon (1984) = upward succession of Garadaoua Fm, Ader Doutchi Fm and Birni N'Konni Fm in the group (see formation entries for details)
References: Hanon, 1984, 1990; Dikouma, 1990.
[Figure 1: Stratigraphic relationship of the Dallols Gr over time (Source: Modified from Dikouma, 1990)]
Lithology and Thickness
(see formation entries for details)
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
Underlying unit is the In Wagar Fm
Upper contact
Overlain by Quaternary
Regional extent
GeoJSON
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Fossils
Age
Late Paleocene (Danian) to Oligocene
Age Span:
Beginning stage:
Danian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
66.04
Ending stage:
Chattian
Fraction up in the ending stage:
1.0
Ending date (Ma):
23.04
Depositional setting
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)