The information on this page is a summary description.
The full formal description is available here: Condroz Formation
| Abbreviation | CDZ |
| Parent unit | none |
| Child units | Poulseur Member, Montfort Member, Ciney Member, Comblain-la-Tour Member, Évieux Member, Sains Member |
| Lithological description | The Condroz Formation is made up of interfingering siliciclastic and subordinate carbonate units. The facies is heterolithic: sandstone, arkose, siltstone, shale, often micaceous and dolomitic, marked by various types of sedimentary figures and commonly arranged in sequences, cycles or sets. The reddish and variegated colours, together with the development of primary dolostone, occur in the more proximal areas and locally invade the entire upper part of the Formation. The numerous units composing the Condroz Formation (previously described as formations and members) are presented here in a stratigraphical order but not all members and facies are stratigraphically superimposed as they are mostly laterally stacked and pass to each other. |
| Age | Middle to latest Famennian |
| Thickness | 200-400 m in the type area, diminishing northwards and westwards. |
| Area of occurrence | The Condroz Formation is present in the Dinant Synclinorium, HaineSambreMeuse Overturned Thrust sheets, Vesdre area, BoozeLe Val-Dieu Ridge and Campine Basin. |
| Type locality | No continuous section exposes the whole Condroz Formation, but numerous outcrops and quarries offer good exposures of the various members and facies. |
| Alternative names | Psammites du Condroz, Groupe du Condroz (p.p.) |
| Authors | Mottequin, B., Denayer, J., Delcambre, B., Marion, J.-M. & Poty, E. |
| Date | 23/09/2025 |
| Cite as | Mottequin, B., Denayer, J., Delcambre, B., Marion, J.-M. & Poty, E., 2025. The Condroz Formation, 23/09/2025. National Commission for Stratigraphy Belgium. https://ncs.naturalsciences.be/lithostratigraphy/Condroz-Formation |
| Additional information |
