5.33.1 Montils Formation - MOT

Authors: Groessens et al., 1982; Paproth et al., 1983; Conil & Delcourt, 1989; Doremus & Hennebert, 1995a, 1995b.

Description: Brown, coarse-grained, oolitic dolomite with inconspicuous undulating or lenticular bedding. Black or grey chert is present. Several levels of hard grounds have been recognized. Towards the west, an oolitic limestone level occurs at the base of the formation. The formation overlies the Malon-Fontaine Fm.

Stratotype: Old quarry situated SE of the old tannery of the Montils, at Brugelette.

Area: Western HSA, at least from Péruwelz to Seneffe.

Thickness: About 80 m in the type area.

Age: Moliniacian (Groessens et al., 1982).