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
Cheddar Gorge open-top bus tour operates during the summer. Cheddar cheese is made in the lower part of the gorge. UK 1960s Garage Rock band The Troggs used Cheddar Caves as the backdrop for the band photo on their debut album "From Nowhere – The Troggs", which included the US "Billboard" no.1 hit single (no.2 UK), "Wild Thing". Cheddar Gorge was the setting for Peter Nichols' 1968 comedy "The Gorge", in the BBC's Wednesday Play series. Cheddar Gorge is a panel game played on the BBC Radio 4 series "I'm Sorry I Haven't a Clue". The gorge was used as a location