St. Dunstan's Well Catchment

St. Dunstan's Well Catchment
	Site of Special Scientific Interest
	Location within Somerset
Area of Search	Somerset
Grid reference	ST668475
Coordinates	51.2257°N 2.4768°W
Interest	Biological and Geological
Area	39.8 hectares (0.398 km2; 0.154 sq mi)
Notification	1967
	Natural England website

St. Dunstan's Well Catchment (grid reference ST668475) is a Site of Special Scientific Interest, covering 39.8 hectares (98.3 acres) near Stoke St Michael in the Mendip Hills, Somerset, England. The site was notified in 1967. It is of both geological and biological significance.

Formerly known as Stoke St Michael Slocker, it contains nine SSSI units consisting of rock and calcareous grassland.[1]

Geological

St Dunstan's Well Catchment is an important and well-known cave system which includes a series of spectacularly-decorated caves which in total extend to about 4 miles (6.4 km) of mapped passage. The caves at Fairy Cave Quarry were formed mainly by the erosive action of water flowing beneath the water-table at considerable pressure (so called 'phreatic' development), but as the water table has fallen many of the caves now lie well above it and the system now contains a variety of cave formations (stalagmites, stalactites and calcite curtains) which in their extent and preservation are amongst the best in Britain. Shatter Cave and Withyhill Cave are generally considered to be amongst the finest decorated caves in Britain in terms of their sheer abundance of pure white and translucent calcite deposits.

Biological

An area of nationally rare species-rich unimproved calcareous grassland of the Sheep's-fescue-Meadow Oat-grass type occurs in the field to the east of Stoke Lane Quarry. Small numbers of greater horseshoe bat (Rhinolophus ferrumequinum), lesser horseshoe bat (Rhinolophus hipposideros) and Natterer's bat (Myotis nattereri) hibernate in the cave system.[2]

References

"SSSI units for St. Dunstan's Well Catchment". Natural England. Retrieved 12 January 2014.
"St. Dunstan's Well Catchment" (PDF). English Nature. Retrieved 20 July 2006.

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[1] "SSSI units for St. Dunstan's Well Catchment". Natural England. Retrieved 12 January 2014.

[2] "St. Dunstan's Well Catchment" (PDF). English Nature. Retrieved 20 July 2006.

Geological Sites of Special Scientific Interest in Somerset
Summary	Summarised data for all sites (biological and geological)
SSSIs	Ben Knowle Blue Anchor to Lilstock Coast Brean Down Brimble Pit and Cross Swallet Basins Bruton Railway Cutting Cheddar Complex Cloford Quarry Cook's Wood Quarry Crook Peak to Shute Shelve Hill Doulting Railway Cutting Emborough Quarries Glenthorne Godminster Lane Quarry and Railway Cutting Greylake Ham Hill Hobbs Quarry Holwell Quarries Hurcott Farm Hurcott Lane Cutting Lamb Leer Langport Railway Cutting Laycock Railway Cutting Leighton Road Cutting Low Ham Maes Down Maesbury Railway Cutting Miller's Hill, Milborne Wick Moon's Hill Quarry Priddy Caves Priddy Pools Rodney Stoke SSSI Sandpit Hole and Bishop's Lot Seavington St Mary Shepton Montague Railway Cutting Snowdon Hill Quarry St. Dunstan's Well Catchment Thrupe Lane Swallet Vallis Vale Viaduct Quarry Windsor Hill Quarry Wookey Hole Wookey Station Wurt Pit and Devil's Punchbowl
Neighbouring areas	Avon Devon Dorset Wiltshire

Biological Sites of Special Scientific Interest in Somerset
Summarised data for all sites (biological and geological)
Aller and Beer Woods Aller Hill Asham Wood Axbridge Hill and Fry's Hill Babcary Meadows Barle Valley Barrington Hill Meadows Berrow Dunes Black Down and Sampford Commons Brean Down Bridgwater Bay Briggins Moor Catcott, Edington and Chilton Moors Chancellor's Farm Cheddar Complex Cheddar Reservoir Cheddar Wood Cleeve Hill Cogley Wood Crook Peak to Shute Shelve Hill Curry and Hay Moors Deadman Draycott Sleights Dunster Park and Heathlands East Polden Grasslands Ebbor Gorge Edford Woods and Meadows Exmoor Coastal Heaths Fivehead Woods and Meadow Freshmoor Friar's Oven Ge-mare Farm Fields Great Breach and Copley Woods Grove Farm Hardington Moor Hestercombe House Holme Moor & Clean Moor King's Sedgemoor Kingdown and Middledown Kingweston Meadows Lang's Farm Langford Heathfield Langmead and Weston Level Long Lye Long Lye Meadow Longleat Woods Millwater Moorlinch Nettlecombe Park North Brewham Meadows North Curry Meadow North Exmoor North Moor Old Iron Works, Mells Perch Porlock Ridge and Saltmarsh Postlebury Wood Priddy Pools Prior's Park & Adcombe Wood Quantock Hills Quants Ringdown River Barle Rodney Stoke Roebuck Meadows Ruttersleigh Severn Estuary Shapwick Heath Sharpham Moor Plot South Exmoor Southey and Gotleigh Moors Southlake Moor Sparkford Wood St. Dunstan's Well Catchment Stowell Meadow Street Heath Tealham and Tadham Moors Thurlbear Wood and Quarrylands Twinhills Woods and Meadows Vallis Vale Walton and Ivythorn Hills West Moor West Sedgemoor Westhay Heath Westhay Moor Wet Moor Whitevine Meadows Windsor Hill Marsh Wookey Hole Woolhayes Farm
Neighbouring areas Avon Devon Dorset Wiltshire