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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Tazolé Formation

Tazolé Fm

Period:

Cretaceous

Age Interval:

Lower Cretaceous (Aptian) (1)

Province:
Iullemmeden Basin

Type Locality and Naming

The Tazolé Formation forms the “Falaise de Tiguidit” (Tiguidit cliff – see Figure in Tiouraren Fm), a sandstone cliff that is shaped almost in a semi-circle southwest and south of the city of Agadez.. Group: Tégama Gr

References: Faure, 1966, p. 110; Greigert & Pougnet, 1967; Taquet, 1976; Fabre et al., 1983; Moody & Sutcliffe, 1991; Moody, 1997; Rauhut & López-Arbarello, 2009.

Synonym: Tazole Fm, Tigguedi or Tiguedi Formation of Greigert & Pougnet (1967); Terzikasan Formation of Moody & Sutcliffe (1991). The Terzikazan, Amezrou, Anyeli, Tin Sakan and the lower part of the Girmaga formations of Molinas (1965). Equivalent(s): Angornakouer Fm (part of the Téfidet Gr) in Téfidet Sub-Basin

Lithology and Thickness

Coarse gray-white to purplish sandstones, quite hard, with a black patina, supporting coarse sandstones and fine silicified sandstones. Conglomerate levels are common; the “Batéma” facies are characterized by yellowish, beige, or red sandstones with medium grain and areas of gravel beds. Thicknesses range from a few meters up to an average of 150 m. In the southeast, it can reach 240 m.

Lithology Pattern:

Coarse-grained sandstone

Relationships and Distribution

Lower contact

Underlain by the Tiouraren Fm (Irhazer Gr). Although no apparent angular unconformity exists between the Tiouraren Fm and Tazolé Fm, the base of the Tégama Gr undoubtedly has an erosional contact with the underlying Tiouraren Fm.

Upper contact

Overlain by the Elrhaz Fm (Tégama Gr)

Regional extent

GeoJSON

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Fossils

Abundant silicified wood

Age

Lower Cretaceous, most likely all Aptian but could have some Barremian levels.

Age Span:

Beginning stage:

Barremian

Fraction up in beginning stage:

0.8

Beginning date (Ma):

122.42

Ending stage:

Aptian

Fraction up in the ending stage:

0.65

Ending date (Ma):

116.07

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)