At the Jegertosse the enormous forces that have worked during the Alpine folding is particularly well visible: the originally horizontally deposited sediment layers in the primordial ocean Tethys and the primary rock from earlier mountain folding were pushed up and folded. Some of the folds were also shifted. In the Gastern valley the two rock types coming together are well recognizable: The yellowish rock bands are limestone while the darker have granitic origin. The Prealps are characterized by two geological rock units: the Helvetic naps of limestone and the Aar granite. This effects also the vegetation which grow in habitats according the composition of the underground and the soils built on it.