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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Tamamaït Formation

Tamamaït Fm

Period:

Permian

Age Interval:

Upper Permian (1)

Province:
Iullemmeden Basin - Tim Mersoï Sub-basin

Type Locality and Naming

Group/Subgroup: Upper Izégouandane Gr

References: Faure, 1966; Valsardieu, 1971; Fabre et al., 1983; Fabre, 2005.

Synonym: Tamamait Fm

Lithology and Thickness

It includes several lower-order sequences made up of fine sandstones with calcareous cement and clays. The sandstone channels take an NW or NE direction. The Formation consists of two characteristic beds of medium to fine sandstone, pink in color, feldspathic, and numerous small pebbles of brown argillites. Limestone cement is very abundant. A layer of silty clay with fine sandstone lenses and clayey micro-conglomerates with clay pebbles is interposed between the two beds. The thickness of the layers is regular in the N-W of the flexure of Izeretagen, where the whole of the three levels reaches about forty meters of thickness. In the Aokaré region, the sand-argillite sequences proliferate. At the edge of the Aïr, to the S-E of the Madaouela flexure, the sandstone of the Tamamaït Fm is coarser, and the beds' regularity no longer exists. In all cases, the Tamamaït Fm is characterized by the abundance of fine to medium sandstone, with isogranular tendency, with calcareous cement, of gray or pink tint, with limestone slabs and oblique stratifications. 80 m thick.

Lithology Pattern:

Sandstone

Relationships and Distribution

Lower contact

Is either on the Téjia Fm or the Izégouande Fm

Upper contact

Overlain by the Moradi Fm

Regional extent

GeoJSON

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Fossils

Age

Upper Permian

Age Span:

Beginning stage:

Wuchiapingian

Fraction up in beginning stage:

0.75

Beginning date (Ma):

255.57

Ending stage:

Wuchiapingian

Fraction up in the ending stage:

1.0

Ending date (Ma):

254.24

Depositional setting

Continental fluvio-lacustrine

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)