Reinterpretation of the Neogene sediments of the Bree Uplift, NE Belgium

1. Introduction The present geological map at scale 1:50 000 of the Flemish Region (Sels et al., 2001; Buffel et al., 2001; also published by the Flemish Authorities on www.dov.vlaanderen.be as the map layer Tertiair geologische kaart 1:50 000, https://www.dov.vlaanderen.be/portaal/?module=verkennerb Sintubin et al., 2001). It is a segment in the bundle of NW-SE trending faults that delimit the Roer Valley Graben (RVG) at its south-western margin (Fig. 1A, 2). NE of the faults, inside the graben (Fig. 1B), much younger strata occur, as the graben has been actively subsiding during the Neogene and Quaternary. The strata that correspond to the outcrop in the BU lie almost 200 m deeper inside the graben (Stainier, 1911; Legra