Top of Konradfels, Middle Swabian Alb. volcanic rock, lithified rest of a volcanic pipe of a phreatomagmatic volcano of the “Urach-Kirchheimer Vulkangebiet” (Swabian Volcanoes). The not dark gray fragments within the mass of tuff are Xenolithes (non volcanic material), mostly White Jurassic of the Swabian Alb. The pipe’s volcanic rock contains magnetized minerals, which produce magnetic anomalies in relation to the earth’s magnetic field. Here and next to the top of Calver Bühl (at Dettingen an der Erms) compass data are therefore extremely false. Only in very few cases volcanic rock is visible on the bare surface. Only due to sensitive geophysical methods, which traced anomalies, was it possible to double the findings of volcanic pipes to contemporary 356 (2016).