Caves of the Mendip Hills
The caves of the Mendip Hills are formed by the particular geology of the Mendip Hills: large areas of limestone worn away by water makes it a national centre for caving. The hills conceal the largest underground river system in Britain.
The hills consist of anticlines of Carboniferous Limestone lying over Devonian Old Red Sandstone. When a surface stream running down one of the impermeable Sandstone peaks reaches the layer of Limestone it sinks below ground through a "swallet", (also known locally as a "slocker"), continuing on its way down towards sea level by enlarging existing cracks in the rock to form caves, and reappearing at the base of the limestone outcrop. As the water changes route within the hill, finding a more direct route, some caves (or parts of caves) are left dry.
There is characteristic type of Mendip cave, in which there is an initially steep descent, and then a more level stretch ending in a "sump" as the cave reaches and descends below the prevailing water table. The passages below the water table (which may be accessible by cave diving) often have a loop formation caused by the water flowing down a bedding plane and then rising up a fracture in the rock. Few caves on the Mendip Hills are more than 150 metres (492 ft) deep or a few kilometres in length, (with some notable exceptions, such as Swildon's Hole which is over 9 kilometres (6 mi) long), but a number are complex with several levels of passages which have been abandoned by the water, for example those around Cheddar.
The catchment area of the Cheddar Yeo, which rises in Gough's Cave, measures 54 km2 (20.8 sq mi). Dye marking shows that some of the water travels underground for up to 10 miles (16 km), taking up to 14 days to reach Cheddar.
The earliest scientifically dated human cemetery in Britain was found at Aveline's Hole, in Burrington Combe. The human bone fragments it contained, from about 21 different individuals, are thought to be between roughly 10,200 and 10,400 years old.
Archaeological evidence including pottery, flints, hearths, coins, burials and metalwork from the Mesolithic, Neolithic, Bronze Age, Iron Age and Roman eras have been found in many of the caves. A number of Mendip caves were found by miners, for example the Banwell Caves which were opened by ochre miners in 1757.
Many caves in the Mendip area were photographed by caver Harry Savory early in the 20th century using huge cameras, glass plates and flash powder. His work has been described as "...of a quality to shame virtually all modern cave photographers". The 1990 book A Man Deep in Mendip: The Caving Diaries of Harry Savory, 1910-1921 provides a diary made by Harry Savory, explained and extended by his son John.
A number of important cave excavations and explorations were undertaken, from the 1920s onwards, by pioneer caver Herbert E. Balch.
The caves which are easily accessible to the public are at Cheddar Gorge and Wookey Hole, but the vast majority of the caves require specialist equipment and knowledge. Many of the caves are gated and operate leader systems in an attempt to reduce the damage caused when the caves are visited. Local caving groups organise trips and continue to discover new caverns. Some estimates put the number of cavers active on the Mendip Hills over a busy weekend at more than 500.
Attempts made in the Mendip Hills to move from one cave to another through the underground rivers led to the development of cave diving; the first cave dive attempt in Britain took place at Swildon's Hole in 1934. The first successful cave dive in Britain was achieved the following year at Wookey Hole, where the last sump is currently the deepest sump in Britain at 90 m (295 ft). 
Sites of Special Scientific Interest
The cave complexes at St. Dunstan's Well Catchment, Thrupe Lane Swallet, Lamb Leer and Priddy Caves have been identified as geological Site of Special Scientific Interest. There are also caves within the Cheddar Complex SSSI.
List of caves
A selection of the better known caves are listed below
- "Fact Sheet 8: Rivers" (PDF). Cheddar caves. Archived from the original (PDF) on 2006-12-15. Retrieved 2007-01-27.
- "Mendip Caves: How caves form". British Geological Survey. 2008. Retrieved 2009-02-06.
- "Mendip Caves: Introduction". British Geological Survey. 2008. Retrieved 2009-02-06.
- "Mendip Caves: Wookey Hole Catchment". British Geological Survey. 2008. Retrieved 2009-02-06.
- "Mendip Caves: Cheddar Catchment". British Geological Survey. 2008. Retrieved 2009-02-06.
- "Mendip Caves: Western Mendip". British Geological Survey. 2008. Retrieved 2009-02-06.
- "Earliest British cemetery dated". BBC News. 2003-09-23. Retrieved 2007-01-27.
- "Aveline's Hole - An Early Mesolithic Cemetery Site in the Mendips". Rick Schulting. Archived from the original on 2007-02-08. Retrieved 2007-01-27.
- "Mendip Hills: An Archaeological Survey of the Area of Outstanding Natural Beauty" (PDF). Mendip Hills AONB. Retrieved 2007-01-27.
- "Mendip Caves: The Burrington area". British Geological Survey. 2008. Retrieved 2009-02-06.
- Savory, H. and Savory, J. (1990) A Man Deep in Mendip: The Caving Diaries of Harry Savory, 1910-1921, Southern Illinois University Press, ISBN 978-0-8093-1623-6
- "Mendip". Protect Our Caves. Retrieved 2010-10-08.
- Irwin & Knibbs, Mendip Underground: A Cavers Guide
- Hanwell, Jim; Price, Duncan; Witcombe, Richard (2010). Wookey Hole - 75 years of cave diving and exploration. Wells: Cave Diving Group. pp. 338–340. ISBN 978-0-901031-07-5.
- "Charterhouse Cave". UK Caves database. Retrieved 2009-09-05.
- "Mendip". UK and Ireland Cave Lengths and Depths. Retrieved 2007-01-15.
- Barrington, Nicholas; Stanton, William (1977). Mendip: The Complete Caves and a View of the Hills. Cheddar Valley P. ISBN 0-9501459-2-0.
- Irwin, David John; Knibbs Anthony J. (1999). Mendip Underground: A Cavers Guide. Bat Products. ISBN 0-9536103-0-6.
- Gray, Alan; Taviner, Rob; Witcombe, Richard (2013). Mendip Underground: A Caver's Guide (5th ed.). Wells: Mendip Cave Registry and Archive. ISBN 9780953131051
- Mendip Cave Registry and Archive
- Mendip Caving Group
- Council of Southern Caving Clubs
- Google Map of Mendip Caves from Bracknell District Caving Club
- Cerberus Spelaeological Society