The information on this page is a summary description.
The full formal description is available here: Ombret Formation
Abbreviation
OMB
Parent unit
Child units
Lithological description
An upper sandstone-slate member of turbiditic nature in its upper part with obliquely stratified quartzitic sandstone up to several dm thick; a lower member with black shale with rare always thin micaceous sandstone intercalations (Martin et al., 1970). The upper sandstone-slate member has a similarity with the Ittre Fm in the Brabant Massif.
Age
Based on acritarchs and chitinozoans a definite Late Ordovician age is proposed, and probably Caradoc (Martin et al., 1970).
Thickness
Upper sandstone-slate member: about 300 m; lower black shale member: >50 m.
Area of occurrence
Northern side of the Condroz inlier, NW of Huy.
Type locality
Large outcrop along the road N90, north-west of the church of Ombret-Rawsa, below the hill Tier dOlne.
Alternative names
Authors
Verniers, J., Herbosch, A., Vanguestaine, M., Geukes, F., Delcambre, B., Pingot, J.-L., Belanger, I., Hennebert, M., Debacker, T., Sintubin, M. & De Vos, W.
Date
01/01/2001
Cite as
Verniers, J., Herbosch, A., Vanguestaine, M., Geukes, F., Delcambre, B., Pingot, J.-L., Belanger, I., Hennebert, M., Debacker, T., Sintubin, M. & De Vos, W., 2001. The Ombret Formation, 01/01/2001. National Commission for Stratigraphy Belgium. https://ncs.naturalsciences.be/lithostratigraphy/Ombret-Formation
