In the western part of the Allgäu Alps there is no continuous main ridge. From the Fellhorn to the Widderstein, there is a ridge in front of the main chain, which terminates in a semicircle at the head of the Kleines Walsertal valley. The mountain chain character of the Allgäu Alps is interrupted by the Ifen and the Gottesacker Plateau (Cretaceous rocks). Here a karst plateau has been formed - uniquely for the Allgäu Alps and beyond. Further north the Flysch Mountains again form small chains. This is followed by Nagelfluh chain which is made of molasse. This is the most attractive molasse mountain range sculpted in the entire Alps. The lower mountains further north also form small chains.