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Welcome. We are the Friends of High Cliff State Park These hard but fractured limestone layers are part of the Niagara Escarpment the edge of a vast sedimentary rock layer that once formed on the bottom of ancient seas. It keeps its cliff edge because the soft shale underneath erodes leaving the dolomite overhanging until it breaks off and forms a new cliff face. In Search Of a new design for Friends of High Cliff Merchandise.