Fig. 3
From: Subglacial tunnel valleys in the Alpine foreland: an example from Bern, Switzerland
a The geological framework of the study area and the ice margin during LGM (black line). b Boreholes used for restoring the subsurface map of bedrock. The green dots are boreholes which reached the bedrock surface at their endpoint, blue dots are drillings which ended in the unconsolidated sediments. c Thickness pattern of the unconsolidated sediments. This equals the difference between the topography of today and the reconstructed bedrock surface. d The reconstructed relief of bedrock surface. The coloured area represents the reconstructed bedrock surface in meter a.s.l. The grey shaded areas are locations where the Molasse bedrock is exposed at the surface