The spectacular scenery of Cornwall and the Isles of Scilly is the result of some 400 million years of geological history. Rock types range from sedimentary mud and sandstones to igneous ones of granite and those of volcanic origin. Local geology can be seen in pebbles on the beach, and in towns, villages and countryside in buildings and hedges. The coast and moors exhibit some of the most dramatic rock exposures, many of them Sites of Special Scientific Interest. This book describes and explains the best sites, and gives a gallery of rock types that may be encountered in Cornwall.