Report on the Geology of Cornwall, Devon and West Somerset

accumulated adjoining appear arenaceous argillaceous slates Austell beach Beacon beds beneath Bristol Channel calcareous matter carbonaceous carbonaceous series Carn chalk character chert clay cliffs coast conglomerate considerable considered containing copper Cornish Cornwall and Devon Cove cross courses crystals Dartmoor deposits detrital Devon and Cornwall direction district divisional planes east elevation elvan engine estuary feet felspar fissures formed Fowey fragments Geol geological granite grauwacke gravel green sand greenstone Gwennap Hill hornblende igneous land lias lime limestone lodes lower Lyme Regis Marazion marls mass mica miles mineral veins mines noticed numerous observed obtained occur organic remains Padstow Plymouth porphyry portion produced quantity quartz readily red sandstone series Redruth sandstone schistose schorl sedimentary seen stone substances suppose surface Tavistock tinners tion tons Trans trappean rocks traversed valley vicinity Wheal William de Wrotham