The gently tilted, wooded plateau of the Waldenburg Hills, which is crossed by the valleys of the aforementioned streams, consists of beds of the Middle Keuper. In ascending order are gypsum keuper, reed sandstone and the Lower Bunter Marl. The majority of the plateau is covered by gravel sandstone. In the south around Neunkirchen, Witzmannsweiler and Büchelberg the rock sequence extends to the Upper Bunter Marl and Stuben sandstone.