Geological classification is essentially based on a simplified scheme proposed by Kemski et al. (2001, 2009), slightly modified by merging some groups (e.g. all Mesozoic) and splitting up others. All data are stored in the German Rn databank ”BURG”. A list of the geological classes is given in the Annex, Table 2. The German territory is divided into 10 km 10 km cells, to each of which (with a few exceptions) a geological class is assigned, see Fig. 5 in the Annex. (Ill-assignment of geology to cells, or geological misclassification of cells, is possible, but this is not subject of this study.)