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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Timesgar Formation

Timesgar Fm

Period:

Cambrian, Ordovician

Age Interval:

Cambrian-Ordovician (1)

Province:
Iullemmeden Basin - Tim Mersoï Sub-basin

Type Locality and Naming

Joulia, 1959. Group: In-Azaoua Gr

References: Joulia, 1959; Claret & Tempère, 1968; Valsardieu, 1971; Fabre et al., 1983; Abdoulaye et al., 2007.

Synonym: Timesguar, Timesugar (all misspellings), "Grès de Timesgar", "Grès anisométrique de Timesgar”. Equivalent(s): Possibly the base of the Hasawnah Fm of the Djado Basin

[Figure 1. Map of the Tim Mersoï Sub-Basin and the Tin Séririne syncline showing the locations of the three sections studied by Claret & Tempère (1968) (Source: Map modified from Mammar, 2012)]

Lithology and Thickness

Begins with a thick conglomerate resting on the basement, transitioning to a coarse sandstone, with white clay cement; very gradual transition to the upper layers; numerous beds of fine gravel and argillo-psammitic events. Thickness: 120 m in In Azaoua and 400 m in In Guezzam. The average is 180 m.

[Figure 2. The complete In-Azaoua Group at Claret & Tempère (1968)’s section #1 location in Algeria (see Fig. 1) (Source: Modified after Claret & Tempère, 1968)]

[Figure 3. The In-Azaoua Group at Claret & Tempère (1968)’s section #2 location (see Fig. 1) (Modified after Claret & Tempère, 1968)]

[Figure 4. Sub-division of the Cambrian-Ordovician In-Azaoua Group west of the Aïr Massif between sections #2 and #3 of Claret & Tempère (1968) (Source: Modified after Abdoulaye et al., 2007)]

Lithology Pattern:

Sandstone

Relationships and Distribution

Lower contact

Precambrian is below.

Upper contact

Overlying Unit: In Niger, the Tindi Fm; in Algeria, the "Argillaceous Sandy formation with Traces" [See description with In-Azaoua Gr]

Regional extent

GeoJSON

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Fossils

Scoliths, Bilobites, Cruziana. Some tigillite levels.

Age

Age Span:

Beginning stage:

Wuliuan

Fraction up in beginning stage:

0.0

Beginning date (Ma):

509.00

Ending stage:

Guzhangian

Fraction up in the ending stage:

1.0

Ending date (Ma):

497.00

Depositional setting

Marine

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)