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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Boulakoura Formation

Boulakoura Fm

Period:

Paleogene

Age Interval:

Oligocene (3)

Province:
Iullemmeden Basin - South Damergou & Koutous

Type Locality and Naming

Upper portion of the Koutous Plateau, Damergou

[Figure 1: The Boulakoura Formation on the upper portion of the Koutous Plateau, Damergou (Faure, 1966, page 350)]

References: Faure, 1966; Gavaud, 1975; Fabre et al., 1983.

Synonym: "Bella Kora" Fm; Boulakoura Fm. Equivalent(s): The oolite pebbles caught in a Quaternary ferruginous cuirass of the Zaouzaoua Fm (Damergou) and Boulakoura Fm (Koutous) are remnants of the erosion of the Ader Doutchi Fm (Ct1)

Lithology and Thickness

Pebbles and blocks of continental origin cemented by iron oxide. The blocks contain ferruginous oolites identical to the Dollé Fm and Homodji Fm. This leads Faure (1966) to think that the ferruginous oolitic formation extended above the Koutous before being dismantled and rearranged in the terraces of the Early Quaternary. Its thickness is about 2 to 4 m.

Lithology Pattern:

Aus conglomerate

Relationships and Distribution

Lower contact

Underlying unit is the Koutous Gr

Upper contact

Overlain by Quaternary

Regional extent

Iullemmeden Basin - South Damergou and Koutous

GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[9.27,15.5],[8.82,15.5],[8.38,15.04],[8.09,14.62],[8.85,14.53],[9.41,14.99],[9.27,15.5]]]]}}

Fossils

None

Age

Age Span:

Beginning stage:

Rupelian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

33.90

Ending stage:

Rupelian

Fraction up in the ending stage:

1.0

Ending date (Ma):

27.29

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)