E.M.Durrance and D.J.C.Laming editors. 1982 The Geology of Devon University of Exeter ISBN 0 85989 247 6 J.W.Perkins 1971 Geology Explained in South and East Devon David & Charles ISBN 0 7153 5304 J.W Perkins 1972 Geology Explained:Dartmoor and the Tamar Valley David & Charles ISBN 0 7153 5516 3 C.M.Bristow 1996 Cornwall’s Geology and Scenary, An introduction Cornish Hillside Publications ISBN 1 900147 01 7 Cox,Price and Hart 1974 The Practical Study of Crystals,Minerals and Rocks McGraw Hill ISBN 07 084035 0 Hatch, Wells,Wells 1961 Petrology of the Igneous Rocks George Allen and Unwin ISBN Not known S Lamb, D. Sington 1998 Earth story, The shaping of our world BBC Books ISBN 0 563 38799 8 J.Hayward 1991 Dartmoor 365 Curlew Publications ISBN 0 9514037 2 9