Geological profile of the Miocene “Swabian volcano”, Middle Swabian Alb, mapping present and past developments. This reconstruction is the result of extensive field studies in the thirties, during which the second largest volcano, the Jusi and others, had several excellent outcrops. 1941 the geologist Hans Cloos published a comprehensive paper and defined the term “Schwäbischer Vulkan” for the “Urach-Kirchheimer Vulkangebiet”.