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Bulu Formation
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Bulu Fm base reconstruction

Bulu Fm

Period: 
Ediacaran

Age Interval: 
600–613 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 C2 Formation (subdivided into C2a–C2h members).

Reference section:


Lithology and Thickness

alternating calcareous shale and sandstone, clayey and sandy limestone, shale. Subdivided into C2h through C2a members. Thickness: ≥ 400 m.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Underlain by the C1 (Dolomies Roses) Fm.

Upper contact

Overlain by the Luanza 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 (400m of 640m) between 600–635 Ma

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.36

    Beginning date (Ma): 
600.37

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.23

    Ending date (Ma):  
612.87

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.