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Bangu Formation
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Bangu Fm base reconstruction

Bangu Fm

Period: 
Ediacaran

Age Interval: 
575–584 Ma


Province: 
West Congo Basin / Bas-Congo region, DRC

Type Locality and Naming

Lukala area, Bas-Congo, DRC. The Schisto-Calcaire Subgroup is subdivided into C1–C5 formations (Delhaye & Sluys, 1923; Cahen, 1954).

Synonym:

Includes C5 Formation, Bangu Formation. Includes the Kisantu Oolite unit.

Reference section:


Lithology and Thickness

magnesian ± organic limestone and dolomite, with oolite, chert, shale and calcareous shale beds; calcareous conglomerates or breccias at the base, overlain by talceous/silicified oolite or pseudo-oolite lenticular beds in shale ("Kisantu oolite" unit) Thickness: 155–265 m [210 m ave].


Lithology Pattern: 
Oolitic limestone


Relationships and Distribution

Lower contact

Underlain by the Lukunga Fm.

Upper contact

Overlain by the Ngandu Fm.

Regional extent

West Congo Belt (DRC, Republic of Congo, Gabon, NW Angola).


GeoJSON

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Fossils

Stromatolites, cyanobacterial mats (Siphonophycus septatum), oolites, oncolites.


Age 

Interpolated by thickness (~210m of 600m) between 575–600 Ma

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.62

    Beginning date (Ma): 
575.36

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.53

    Ending date (Ma):  
584.01

Depositional setting

Ramp composed of deep-marine outer ramp to shallow-marine inner ramp with oolitic shoal barrier, stromatolitic bioherms, lagoon- and sabkha-type environments (Cahen, 1954; Alvarez, 1995; Delpomdor et al., 2015).


Depositional pattern:  


Additional Information


Compiler:  

Cailteux, J.L.H., Delpomdor, F.R.A., & Ngoie Ndobani, J.-P. (2015). The Neoproterozoic West-Congo 'Schisto-Calcaire' sedimentary succession from the Bas-Congo region (Democratic Republic of the Congo) in the frame of regional tentative correlations. Geologica Belgica, 18/2-4, 126–146.