5.7. Namur Group - NAM

Authors: Dupont,1863; Paproth et al., 1983.

Description: The Engihoul Dolostone and the Longpré, Terwagne and Neffe formations, when dolomitized, compose the Namur Group. It comprises dark to brown, usually thick-bedded, coarse-grained dolomites. Calcite and dolomite nodules are abundant locally. Dolomitized macrofossils (brachiopods, corals) are more or less common.

Stratotype: Rochers de Marche-les-Dames on the north side of the Meuse valley, downstream of Beez.

Area: NSA. To the east, the group extends up to Solière, from where the Longpré, Terwagne and Neffe formations are not dolomitized.

Thickness: About 200 m in the stratotype. The thickness varies from 100 to 200 m, depending of the extension of the dolomitization upwards.

Age: Late Hastarian and Moliniacian (based on the age of the corresponding non dolomitized formations).