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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Terminal Complex Formation

Terminal Complex Fm

Period:

Ordovician

Age Interval:

Hirnantian (1)

Province:
Iullemmeden Basin - Tim Mersoï Sub-basin

Type Locality and Naming

B.R.P. et al., 1964. Group: In-Azaoua Gr

References: B.R.P. et al., 1964; Claret & Tempère, 1968; Fabre et al., 1983.

Synonym: Complexe terminal; Equivalent(s): Possibly the Ka Member of the Kandi Fm.

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

Lithology and Thickness

Conglomerate. On an eroding surface with gullies up to 50 m in amplitude, this is a set of conglomeratic or coarse to fine sand in platelets characterized by tormented sedimentation. Its thickness is 25m.

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

Lithology Pattern:

Conglomerate

Relationships and Distribution

Lower contact

Underlying unit is the In-Azaoua Fm

Upper contact

Overlain by the Graptolitic Shales Fm

Regional extent

GeoJSON

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Fossils

Age

Age Span:

Beginning stage:

Hirnantian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

445.21

Ending stage:

Hirnantian

Fraction up in the ending stage:

1.0

Ending date (Ma):

443.07

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)