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Walls Boundary Fault
This forms the boundary with the Walls Peninsular where rocks on opposite sides of the fault have moved relative to each other by more than 100 kms, mainly during the Devonian and Middle Jurassic periods. Showing as a shallow depression with a boggy floor, the fault has crushed and crumpled schist on the West side against tougher granite on the East. Subsequent erosion of the schist formed the sandy bay exposing a steep cliff of granite. This is the best exposure of a shear fault in Britain.
Walls Boundary Fault
This forms the boundary with the Walls Peninsular where rocks on opposite sides of the fault have moved relative to each other by more than 100 kms, mainly during the Devonian and Middle Jurassic periods. Showing as a shallow depression with a boggy floor, the fault has crushed and crumpled schist on the West side against tougher granite on the East. Subsequent erosion of the schist formed the sandy bay exposing a steep cliff of granite. This is the best exposure of a shear fault in Britain.