Tagora Gr

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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Tagora Gr

Period:

Carboniferous, Permian

Age Interval:

Lower Carboniferous (Upper Visean) to Middle Permian (Wordian). (1)

Province:
Iullemmeden Basin - Tim Mersoï Sub-basin

Type Locality and Naming

Joulia (1959) emend. Claret & Tempère (1968). Comprises the upward succession of the Guezouman Fm, Tchinezogue Fm, Tarat Fm and Madaouela Fm (and Arlit Fm at top, depending upon usage).

References: Joulia, 1959; Bigotte & Obelianne, 1968; Claret & Tempère, 1968; Valsardieu, 1971; Fabre et al., 1983; de Rouvre, 1984, 1985, 1988; Fabre, 2005; Wagani et al., 2011; Billon et al., 2016; Sani, 2021a, 2021b.

Synonym: Série de Tagora

Lithology and Thickness

See Figure; and the individual formations for details. Characterized by fluvio-deltaic to continental shelf deposits. Joulia (1959) distinguishes two sets in this Group separated by an eroded surface and subdivided into formations as follows from top to bottom (Fig. 7-118):

Upper argillaceous (Joulia, 1959) or Madaouela Fm
Sandstone of the Tarat Fm
(discontinuity),
Argillaceous (Tchinezogue Fm ).
Sandstone (Guezouman Fm ) with locally at the base, the Téléflak conglomerate Member.

The geologists of the CEA add, at the top, the Arlit Fm.

[Figure. Lithostratigraphy of the Tagora Group in the Tim Mersoï Sub-Basin also shows the horizons mined for their uranium content.]

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

Transgressive onto the Terada Gr / Talak Fm / Tim Mersoï Fm.

Upper contact

Overlain by the Izégouandane Gr, which starts with the Izégouande Fm.

Regional extent

GeoJSON

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Fossils

Plants (de Rouvre, 1984, 1985, 1988). See individual formations for details.

Age

Lower Carboniferous (Mississippian, Upper Visean) to Middle Permian (Wordian).

Age Span:

Beginning stage:

Visean

Fraction up in beginning stage:

0.8

Beginning date (Ma):

333.62

Ending stage:

Wordian

Fraction up in the ending stage:

1.0

Ending date (Ma):

264.34

Depositional setting

This group corresponds, after a phase of erosion which has carved out paleovalleys in the substratum, to two sandy fluvio-deltaic events ( Guezouman Fm, Tarat Fm ) evolving towards more characteristic marine deposits.

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)