Gargaf 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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Gargaf Gr

Period:

Cambrian, Ordovician

Age Interval:

Cambrian to Ordovician (9)

Province:
Djado Basin

Type Locality and Naming

Burollet, 1960

References: Burollet, 1960; Jacqué, 1963; Shalbak, 2015.

Equivalent(s): In-Azaoua Gr of the Tim Mersoï Sub-Basin.

Lithology and Thickness

A detrital unit constituted by four formations in Niger named, from bottom to top: Hasawnah Fm, Ash Shabiyat Fm, Hawaz Fm, and Chirfa Fm. All these formations are detrital and bounded by unconformities of different nature in Niger. In Libya, the boundary between the Ash Shabiyat Fm and Hawaz Fm is a non-erosive concordant surface. For details, see each formation included in the group.

Lithology Pattern:

Relationships and Distribution

Lower contact

Underlain by the Mourizidié Fm or Precambrian

Upper contact

Overlain by the Tanzuft Fm

Regional extent

GeoJSON

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Fossils

For details, see each formation included in the group.

Age

Cambrian to Ordovician (Burollet, 1960).

Age Span:

Beginning stage:

Paibian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

497.00

Ending stage:

Hirnantian

Fraction up in the ending stage:

1.0

Ending date (Ma):

443.07

Depositional setting

Continental, fluvio-deltaic, shallow marine and glacial, periglacial and glacio-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)