|Loess is a
wind deposit made up of fine dusty sand, which was blown out of the upper
Rhine valley debris fields during the ice age. Each mineral core is covered by
a chalk husk, which gives a very porous, rich and therefore loose, soil.
Accordingly, the danger of erosion is high. Characteristic of the Kaiserstuhl
landscape are the many erosion gorges in the soil with their vertical walls.
Because of this soil property of the loess, the artificial creation of
terraces and deeply sunken paths and roads is made easily possible (see map
betwen steep walls of loess