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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.