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Combe Down and Bathampton Down Mines : ウィキペディア英語版 | Combe Down and Bathampton Down Mines
Combe Down and Bathampton Down Quarries () make up a 6.22 hectare (15.37 acre) Site of Special Scientific Interest (SSSI) in Bath and North East Somerset, notified in 1991 because of the Greater and Lesser Horseshoe bat population.〔(【引用サイトリンク】 work=English Nature SSSI Citation Sheet )〕 The disused quarries dates from the 17th and 18th Century and were used to extract Bath stone for the city of Bath and elsewhere in the UK. A five-year project to stabilise the quarry workings was largely completed by November 2009. == Geology == Combe Down forms a plateau capped by Great Oolite limestones between the valley of the River Avon and Horsecombe Vale. The geology of the region is dominated by rocks of Middle and Early Jurassic ages. The Great Oolite is the uppermost lithology. This is underlain by the clays of the Fuller’s Earth Formation, which in turn is underlain by limestones of the Inferior Oolite and the Midford Sands of the Lias. The Great and Inferior Oolite formations provide effective aquifers (rock in which water can be stored and pass through) for public and private water supplies.
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