Cenozoic

Cretaceous

Jurassic

Triassic

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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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Angornakouer Formation

Angornakouer Fm

Period:

Cretaceous

Age Interval:

Lower Cretaceous (Barremian? to Aptian) (5)

Province:
East Niger Rift Basin - Téfidet Sub-basin

Type Locality and Naming

Group: Téfidet Gr

References: Faure, 1959, 1966; Fabre et al., 1983 ; Konaté et al., 2019.

Synonym: Angornakeur (misspelling). Equivalent(s): Tazolé Fm

Lithology and Thickness

Coarse sandstones, conglomeratic sandstones, feldspathic sandstones with oblique stratification. The sequence begins with beige to pink soft coarse sandstones followed upward by fine-grained and variably argillaceous sandstones. The beds may be conglomeratic or in some places, feldspathic with cross stratifications (Konaté et al. (2019)). 250 m thick.

[Figure 1. Synthetic lithostratigraphic column of the Téfidet trough (Source: Modified from Konaté et al., 2019)]

Lithology Pattern:

Coarse-grained sandstone

Relationships and Distribution

Lower contact

Rests in angular unconformity on the Precambrian crystalline basement

Upper contact

Overlain by the finer and argillaceous layers of the Tagrezou Fm

Regional extent

GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[9.14,19.06],[8.85,18.85],[11.01,17.2],[11.38,17.66],[9.14,19.06]]]]}}

Fossils

Abundant silicified wood (Dadoxylon) (Faure (1966)).

Age

Lower Cretaceous (Barremian? to Aptian).

Age Span:

Beginning stage:

Aptian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

121.40

Ending stage:

Aptian

Fraction up in the ending stage:

0.5

Ending date (Ma):

117.30

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)