“If you are on shale, ‘slate’ or ‘trap’ rock or live outside the areas of the karst features (such as the coal regions), you likely do not have a karst-related sinkhole ...
Karst areas and caves commonly have high aesthetic value and ... Inventory of Scientifically Significant Features in Cave SSSIs. British Geological Survey Commissioned Report CR/02/034. Keyworth, ...
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