Cow and Calf

Millstone grit, a layer of hard sandstone stretching from Edale to Richmond; laid down 320 million years ago when half of Yorkshire was covered by a vast river delta. The millstone grit lies on top of softer layers of shale and on the moor edges, such as here on Ilkley Moor, the shales erode away causing the gritstone to fracture along vertical joints. Gigantic blocks may break off, like the Calf, and slide down the hill.

cow and calf

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