 The Morte Slates are a series of silvery-grey to green coloured slates with some subordinate sandstone and siltstone.A well-developed cleavage has removed what fossils may have earlier been present in these one-time submarine muds.These rocks extend from Morte Point, where they form the coast between Woolacombe and Flat Point, south-southeastwards through West Down and Arlington then east to Withypool.