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Lukunga Formation
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Lukunga Fm base reconstruction

Lukunga Fm

Period: 
Ediacaran

Age Interval: 
584–588 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 C4 Formation, Lukunga Formation (subdivided into C4a1 and C4a2 submembers).

Reference section:


Lithology and Thickness

clayey limestone or dolomite and stromatolitic or oolitic limestone, with many chert layers or nodules; shale, calcareous shale, psammite and sandstone Thickness: ~ 300 m.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Underlain by the Luanza Fm.

Upper contact

Overlain by the Bangu 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 (~300m of 600m) between 575–600 Ma

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.53

    Beginning date (Ma): 
584.01

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.49

    Ending date (Ma):  
587.86

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.