Cheddar Complex the Pleistocene period. Cheddar Caves contain both active and fossil systems. The active cave system is one of the most heavily studied karst systems in Britain with reference to the conduit and diffuse flow characteristics of its hydrology. Charterhouse Caves include four major swallet caves that provide an indisputable record of Pleistocene landform development in the Mendips and surrounding area. Sun Hole Cave provides a varied fauna radiocarbon-dated to the end of the Late Devensian Cold Stage. Several types of limestone including Clifton Down Limestone, Cheddar Limestone and Cheddar Oolite are visible in the Gorge and surrounding areas with pale
Wookey Hole Caves the historic machinery. Visitors to the site are still able to watch a short video of the paper being made from cotton. Other attractions include the dinosaur valley, a small museum about the cave and cave diving, a theatre with circus shows, a house of mirrors and penny arcades. In 1956, Olive Hodgkinson, a cave guide whose husband's family owned the caves for over 500 years, was a contestant on "What's My Line?" The cave and mill were joined, after purchase, by Madame Tussauds in 1973 and operated together as a tourist attraction until there was a management team buyout