Map of the top of the basement under the LCB and the SNCB highlighting the presence of basement highs and throughs of different geometries, orientations and lengths. The map is projected with the Lambert 93 system. The vertical and horizontal represent the grid used to compute the map and not the longitude and latitude lines. The longitude and latitude lines are represented by the cross visible on the map. The Gironville (Gi) and the Saar-1 (Sa-1) wells that reach the basement are highlighted with bigger circles.