Fig. 2From: Subglacial tunnel valleys in the Alpine foreland: an example from Bern, SwitzerlandExample of reconstructed contour lines of bedrock. The contour lines were drawn by hand considering the boreholes that reached the bedrock surface, the contour lines of the bedrock outcrops, the boreholes that did not reach the bedrock surface, and the derived depth of the bedrock surface extracted from published geological profilesBack to article page