3.2.10. Presles Formation - PRE
Authors: Coen-Aubert, Dejonghe, Cnudde & Tourneur, 1985; Coen-Aubert, 1999a.
Description: In the lower part argillaceous and bioclastic limestones containing a few horizons with haematitic ooliths, overlaid by fine greenish shales. In some areas the limestones are dolomitic.
Stratotype:Section along the Namur-Charleroi road, immediately south of Presles.
Area: Northern border of the Dinant Synclinorium from Lustin to Tilff, southern border of the Namur Synclinorium and the Vesdre Nappe.
Thickness: About 10 m in the type area, in other areas between 1 and 16 m.
Age:Lower Frasnian; from the top of Upper falsiovalis to the lower part of the transitans conodont Zones (Coen-Aubert, 1999).