These more easily erodible rocks overlie interstratal karst. The removal of vegetation causes these soils to be highly erodible. The area is dominated by dolomite and highly erodible limestone, making caves numerous. Hoodoo Mountain lies in an area of high elevation ecosystems colonizing very erodible substrate. In the middle Buntsandstein mainly crumbly, easily erodible sandstone formations are developed. Most of the watershed is considered to have slightly erodible soil. The soil of this region has been called the "most highly erodible soil on earth". Natural surfaces are rough and erodible to different degrees. The formation is very hard and not erodible by sea waves.