Fig. 8

Extracts of the georesources map (1:500′000) by Schmidt (1917). top: extracts from the map header and the legend. The displayed raw materials are sorted in groups: (I.1) peat, coal, graphite, (I.2) asphalt, oil, bituminous schists, gas, (II) salt, (III) ores (Fe, Mn, Cu, Mo, Ni, Co, Pb, Zn, Au). bottom left: extract of the lower Valais area (SW Switzerland) illustrating the anthracite/hard occurrences in the Permian and Carboniferous units in the Zone Houillère and the Aiguilles Rouges Massif (dark grey polygons). bottom right: extract of the area between Basel and Solothurn (central northern Switzerland). The red polygon marks an area with high concentration of Eocene pisolithic iron ore deposits (“Bohnerz”) in the Jura fold-and-thrust belt south of Delémont. The pale grey polygon illustrates the belt of halite deposits occurring in the Triassic units southwest of Basel at ca. 100–400 m depth. See the full extent and resolution of this map in Additional file 3. For location of the two map extracts see Fig. 1