The geology of the Dachstein massif is dominated by the Dachstein-Kalk Formation (Dachstein limestone), dating from Triassic times. In common with other karstic areas, the Dachstein is permeated by a rich cave system, including some of the largest caves in Austria, such as the Mammuthhöhle and the Hirlatzhöhle. Another significant tourist destination is the Eisriesenhöhle. The Dachstein is famous for its fossils, including Megalodonts; the Linzer Weg leads over many such fossils, which are referred to as Kuhtritte (cattle footprints).