Fig. 14

a Perspective view looking downstream along the thalweg of the Aare main overdeepening. Note that the valley is U-shaped upstream and then transitions in a cross-section characterized by a bedrock riegel (currently buried by several tens of m-thick Quaternary sediments), which is dissected by one (or multiple) V-shaped inner gorges. Contour lines are shown for every 20 m elevation. The elevation of c. 500 m a.s.l. corresponds to the lowest surface elevation encountered in this survey. b LidarDEM of the region surrounding the current Aare gorge downstream of Innertkirchen at c. 2′658′000/1′174′000 (Swiss coordinate system), which is situated approximately 75 km upstream of Bern. The bedrock ridge is c. 160 m high and dissected by multiple inner gorges. Most of them are filled with glacial till. Currently, the Aare River flows through an inner gorge on the NE margin of the bedrock ridge. We consider the area surrounding the Aare gorge between Innertkirchen and Meiringen as a modern example of the bedrock topography beneath the city of Bern