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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Hasawnah Formation

Hasawnah Fm

Period:

Cambrian

Age Interval:

Middle & Upper Cambrian (9)

Province:
Djado Basin

Type Locality and Naming

Jabal Hasawnah - a local name for Jabal Gargaf (Libya) (Fig. 1). Group: Gargaf Gr

References: Massa & Collomb, 1960; Jacqué, 1963; Lababidi, 1985; Mergl et al., 2001; Shalbak, 2015; Hallet, 2002, 2016.

Synonym: The former name of the Formation was either Hassaouna or Hasaouna. The spelling was modified to its current form by Hallet (2002) after verifying the official name records of localities in Libya.

Lithology and Thickness

Built-up of unfossiliferous, brown to yellowish-brown massive medium- to coarse-grained highly cross-bedded silicified sandstone with abundant conglomeratic lenses. 250 m thick.

[Figure. Stratigraphic column of the Hasawnah Formation at the Type Section (Libya) (Source: Shalbak, 2015).]

Lithology Pattern:

Coarse-grained sandstone

Relationships and Distribution

Lower contact

Underlain by the Mourizidié Fm

Upper contact

Overlain by the Ash Shabiyat Fm

Regional extent

GeoJSON

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Fossils

None in Niger, but Tigillites in Libya

Age

Middle & Upper Cambrian (Massa & Collomb (1960) and reconfirmed by Mergl et al. (2001). [For graphic purposes put as Late Cambrian here.]

Age Span:

Beginning stage:

Paibian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

497.00

Ending stage:

Cambrian Stage 10

Fraction up in the ending stage:

1.0

Ending date (Ma):

486.85

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)