Fig. 7

Field observations along flow paths of the Valserine, Doubs and Areuse rivers (see Fig. 4 for locations). a Valserine valley path in the High Range of the Jura Mountains. The NE–SW directed thrust created a topographic relief, which results in several landslides and rockslides. This valley was filled by glacial deposits and the river incision created a step involving frequent landslides which are correlated with knickpoint location (red circles). b The Doubs River upstream Besançon (External Range). The ENE-WSW directed thrust combined with erosion of the anticline hinge created landslides and rockslides. The younger one (in white) is correlated with knickpoint location (red circle, knickpoint 34 on Fig. 6). c The Areuse steep sided valley trough the High Range. This valley corresponds to a remnant syncline between two NE–SW directed tight folds. The southeastern most one is over-thrusted on the syncline decreasing the valley width. The anticline on left side of the river has a very steep southwestern flank involving frequent landslides and rockslides. On this picture at least two rockslides can be determined; an old one (in transparent light grey) already covered by a forest and a younger one (in transparent white) not yet covered by vegetation. It is still possible to see the ancient river path (in blue dot line). The river has presently restored its path following the older landsliding disturbance but remains deviated by the more recent one, which corresponds to a knickpoint location (red circle)