Wookey Hole Caves then passes through major cave systems such as Swildon's Hole, Eastwater Cavern and St Cuthbert's Swallet, around Priddy, but 95% is water that has percolated directly into the limestone. The southern slopes of the Mendip Hills largely follow the flanks of an anticline, a fold in the rock that is convex upwards and has its oldest beds at its core. On the Mendips the crest of the anticline is truncated by erosion, forming a plateau. The rock strata here dip 10–15 degrees to the southwest. The outer slopes are mainly of Carboniferous Limestone, with Devonian age Old Red Sandstone exposed
Wookey Hole Caves dark parts of the cave where the witch was hiding. The blessed water immediately petrifies the witch, and she remains in the cave to this day. A 1000-year-old skeleton of a woman was discovered in the caves by Balch in 1912, and has also traditionally been linked to the legendary witch. The remains have been part of the collection of the Wells and Mendip Museum, which was founded by Balch, since they were excavated, though in 2004 the owner of the caves said that he wanted them to be returned to Wookey Hole. It was partly down to the legend