Fig. 4

Georesources map of Switzerland (1:500′000) by Weber and Brosi (1883). This map was presented at the first national exhibition 1883 in Zurich and represents the first compilation of this kind at the Switzerland scale. In order to get an overview on the areas that were explored the most, the map is shown here in its full extent. Details are not readable at that map scale. A high resolution version of this map is available here: https://www.e-rara.ch/zuz/doi/10.3931/e-rara-31156. Explanation of the symbols' colours: black: coal, peat, asphalt; yellow: salt, dark green: construction stones raw materials (clays, gypsum, quartz sand, hydraulic limestone, refractory soil); red: natural stones (granite, limestone, marble, sandstone, tuff, schist, potstone); blue: minerals (iron ore, other ores and minerals)