I sketched the relationship between the various gritstone edges using SketchBook Pro overlaying the OS map so that the relationships are to scale.
The main edges (Stanage to Gardom's) are of Chatsworth Grit (318-319 million years). White Edge and Birchen Edge are made of younger Crawshaw Sandstone (314-316 million years) while the lower Bamford Edge is of older Kinderscout Grit (319-321 million years).
Posted with Blogsy
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