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.

Geology

The hills consist of anticlines of Carboniferous Limestone lying over Devonian Old Red Sandstone, with the sandstone exposed on the summits. When a surface stream running off the sandstone reaches the limestone it sinks below ground through a "swallet",, 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 some caves are left dry.
and stalactites in Gough's Cave
There is a 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 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 deep or a few kilometres in length,, 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. Dye marking shows that some of the water travels underground for up to, taking up to 14 days to reach Cheddar.

History

When Banwell Bone Cave was discovered in 1824, it was found to contain a great many animal bones which have been dated as about 80,000 years old.
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 are recorded in the Mendip Cave Registry and Archive.

Access

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.

Cave diving

Attempts made in the Mendip Hills to traverse 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 Caves, where the last sump is currently the deepest in Britain at.

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
NameLocationMapLength Depth Notes
Attborough SwalletChewton Mendip0.2244
Aveline's HoleBurrington Combe0.06716Site of early cemetery & cave markings
Axbridge Ochre MineAxbridge0.13233
Banwell CavesBanwell0.09721geological Site of Special Scientific Interest
Banwell Ochre CavesBanwellgeological Site of Special Scientific Interest
Bos SwalletBurrington Combe0.07637
Bath SwalletBurrington Combe0.07842
Charterhouse CaveCharterhouse4.868205Close, but not connected, to GB Cave. Deepest cave on the Mendip Hills.
Compton Martin Ochre MineCompton Martin0.421geological Site of Special Scientific Interest
Cox's CaveCheddar0.118Open to the general public as a show cave
Drunkard's HoleBurrington Combe0.12748
Eastwater CavernPriddy2.8160One of the Priddy Caves
East Twin SwalletBurrington Combe0.27438-
Fairy Cave Quarry
  • Balch Cave
  • Conning Tower Cave
  • Fairy Cave
  • Fernhill Cave
  • Hillier's Cave
  • Hillwithy Cave
  • Shatter Cave
  • W/L Cave
  • Withyhill Cave
Stoke St Michael1.17<60Many highly decorated.
GB CaveCharterhouse1.95134Part of the Cheddar Complex SSSI.
Goatchurch CavernBurrington Combe0.7555Very popular with novice cavers
Gough's CaveCheddar2.13590Open to the general public as a show cave
Hunter's HolePriddy0.27558One of the Priddy Caves
Lamb LeerEast Harptree0.6467geological Site of Special Scientific Interest
Longwood SwalletCharterhouse1.65175Part of the Cheddar Complex SSSI.
Manor Farm SwalletCharterhouse1.06156
Picken's HoleCompton Bishop-
Pierre's PotBurrington Combe0.46533
Read's CavernBurrington Combe1.22462
Reservoir HoleCheddarLength/depth to be confirmed following the recent discovery of what is believed to be the largest chamber under the Mendip Hills.
Rhino RiftCharterhouse0.25147Part of the Cheddar Complex SSSI.
Rod's PotBurrington0.18845In September 2007, digging established a link through to nearby Bath Swallet
Sidcot SwalletBurrington0.228
St Cuthbert's SwalletPriddy6.7145One of the Priddy Caves. Most complex cave on Mendip.
Stoke Lane SlockerStoke St Michael2.18<60
Swildon's HolePriddy9.15167One of the Priddy Caves. Longest cave on Mendip.
Thrupe Lane SwalletShepton Mallet1.147120geological Site of Special Scientific Interest
Tyning's Barrow SwalletCheddar1.29132
Upper Flood SwalletCharterhouse4.720136
Wigmore SwalletPriddy1.0110One of the Priddy Caves.
Withybrook SlockerStoke St Michael0.2326Upstream part of caves in Fairy Cave Quarry
Wookey Hole CavesWookey Hole3.66182Open to the general public as a show cave