This completely revised edition has been rewritten to reflect the major changes in knowledge since the first edition. There are four additional chapters, on geological pioneers, engineering geology, environmental geology and off-shore geology. The book also lists all official and local sites of geological and geomorphological interest, includes an expanded reference list and a colour geological map. It is aimed at all readers with an amateur or professional interest in geology, and undergraduate fieldworkers should find the book particularly helpful. It is a companion volume to "The Geology of Cornwall" (0-85989-529-7).