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aligned Austell B.Sc Barclays Bank basin biotite blow hole bluffs Boase Bodmin Moor Bolitho British Camborne Camborne Savings Bank Carlyon Bay Carnmenellis china-clay cliffs Cober Cornwall Council Cove degraded Devonian dissection drainage east erosion surfaces estuary bench evidence fact faults faunas feet above O.D. foot surface fossils Fowey Geol Geological Society Geological Survey Goonhilly Downs gorge granite greenstone height Helford River high-water mark horn joints K. F. G. Hosking kaolinisation Kerrier killas lectures limestone Lizard surface low-water lower M.Sc marine minerals mining Museum occur origin Padstow pebbles peneplain peninsula Pentewan Penzance Phacopid plagioclase platform Point Polmear present Proetid Proetus pyrite quartz radioactive Rame region Richter ridge Robson rock S.W. England sand sea level seawards shales shoreline slates slope south-west species specimens spit stream Stufe sub-aerial summit thin-section tion Trevone trilobites Upper Devonian valley veins watershed wave cut platform zone