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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Dambanza Formation

Dambanza Fm

Period:

Cretaceous

Age Interval:

Late Cretaceous (Coniacian to Maastrichtian) (4)

Province:
Iullemmeden Basin - Southeast Aïr & Damergou

Type Locality and Naming

Joulia, 1951, 1953. The Lower (clay-rich) of the Dambanza Fm is included in the Damergou Gr. The Upper portion (sand-rich) of the Dambanza Fm does not belong to any group.

References: Furon, 1934; Joulia, 1951, 1953; Faure, 1963 & 1966, page 159; Petters, 1981; Fabre et al., 1983.

Synonym: Equivalent(s): Upper part of the Dambanza is equivalent to the Majias Gr. The lower portion of the Dambanza is equivalent to the Ibeceten Fm.

Lithology and Thickness

Clays (Lower portion) and coarse-grained sandstones (Upper portion). Many ferruginous levels in platelets in the upper portion of the Dambanza. This level is defined by a coarse sandstone with cross-bedded stratification containing kaolinitic clays, pisolitic and oolitic ironstones, and bauxite defines this level. Its thickness is 50 m for the upper part and 33 m for the lower part.

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

Underlying unit is the Gangara Fm (Refer to Fig. 1)

[Figure 1: Schematic stratigraphic section from Southeast Aïr to the south of Koutous area (Source: Faure, 1963; Petters, 1981)]

Upper contact

Overlying unit is the Zaouzaoua Fm (Fig. 1)

Regional extent

GeoJSON

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Fossils

Age

Late Cretaceous (Coniacian to Maastrichtian)

Age Span:

Beginning stage:

Coniacian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

89.39

Ending stage:

Maastrichtian

Fraction up in the ending stage:

1.0

Ending date (Ma):

66.04

Depositional setting

Continental for the upper part and a mixed continental and marine environment for the lower part.

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)