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Includes Dolomies Roses Formation
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Includes Dolomies Roses Formation base reconstruction

Includes Dolomies Roses Formation

Period: 
Ediacaran

Age Interval: 
613–635 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 Dolomies Roses Formation, C1 Formation, cap carbonate.

Reference section:


Lithology and Thickness

pink or grey dolomite; interbedded purple shale layers at top. Cap carbonate above Marinoan diamictite. Thickness: 0–15 m [8 m ave].


Lithology Pattern: 
Dolomite


Relationships and Distribution

Lower contact

Underlain by the Upper Diamictite (former 'Mixtite') Fm.

Upper contact

Overlain by the Bulu 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 

Anchor age of 635 Ma (base of Ediacaran, Marinoan cap carbonate)

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.23

    Beginning date (Ma): 
612.87

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.00

    Ending date (Ma):  
635.00

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.