Professor K.M.Creer (Newcastle) who arranged this meeting, took the Chair at 2 p.m. In formal contributions, Professor Creer and Dr J.C.Briden (Leeds) discussed the relevant evidence from palaeomagnetism; Professor S.K.Runcorn (Newcastle) discussed how polar wander and continental drift might be attributed to different kinds of convective motion in the mantle; Professor J. Sutton (Imperial College), Dr F. Vine (East Anglia) and Mr B.J.Harland (Cambridge) spoke of various types of geological evidence, particularly of a structural and petrological nature.