Affiliation: | Sub-Department of Geophysics, University of Liverpool, Liverpool.;Caldy Grange Grammer School, West Kirkby, Cheshire.;Department of Geodesy and Geophysics, Madingley Rise, Madingley Road, Cambridge.;Department of Geology, The Open University, Walton Hall, Milton Keynes, Bletchley, Buckinghamshire.;Department of Geology, Sir John Cass College, Jewry Street, London, E.C. |