Striebel, T. (1994): Genetic Conditions of the Sandstone Caves in the Surroundings of Bayreuth, Upper Frankonia, Germany. Proc. 5th Pseudokarst Symposium with International Participation, Szczyrk, Bielsko- Biala, Poland, 17 - 19.
Six genetic processes for the development of caves in upper triassic sandstones near Bayreuth are mentioned: two types of rift caves, boulder caves, erosion caves, weathering caves and karst caves. The development of karst caves is explained with the solution of silicate or ferrugineous binding agent and a subsequent evacuation of the sand. Especially in the case of ferrugineous binder, solution processes caused by acid and/or reduced groundwater or percolating waters is conceivable. Frequent forms, which possibly are karst forms, are tube structures, cavettos, rock shelters and low rooms with no direct connection to the open.
Frequently, multiple processes are essential for the development of one cave. The combinations of rift cave with karst cave and erosion cave with boulder cave are quoted here. The latter combination is typically for some water-penetrated caves of greater extend in narrow gorges.