The Yorkshire Dales are a dissected upland terrain in the northern Pennines of England. One of the most accessible of National Parks, the Dales serve as a recreational area for visitors ranging from climbers to shoppers. Most will not realise that the park boundaries are essentially geological. The area is delimited by the Permian unconformity to the east, the Stainmore Trough to the north, and by steep faults on the other two sides: the Dent Fault to the west and the Craven Faults to the south. The ‘Askrigg Block’, so defined, has a northward tilt and therefore progressively younger Carboniferous...

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