4.2.3. Mariembourg Formation - MAB
Author: Gosselet, 1879b.
Description: Greenish, purplish-blue or reddish argillaceous shales, with nodules or thin interbedded arenaceous rocks or limestone layers.
Stratotype: North of Mariembourg, slopes of the Roly road.
Area: Namur and Dinant Synclinoria.
Thickness: very variable.
Age: Lower Famennian (Fa1b-c). P. crepida conodont zone. The base of the Mariembourg Fm corresponds at Silenrieux to the base of the P. dumonti zone.
Remark: See comment in the Famenne Grp section concerning the validity of the concept of Mariembourg Fm.