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All, A question that I have regarding the discussion of assymetry of subduction zones and the west wandering theory is how does the alpine-himalaya orogeny fit into this scheme? Surely we have north wandering here and hasn't this been the case for a long period? Would it also not be fair to suggest that fragments of gondwana have been north wandering for a long time as well? This may sound naive on my part, but surely if the rotational forces are strong enough to influence plate tectonics globally then why would a small fragment such as India move northwards away from the equator unless other stronger forces were operating and why would peri-gondwanan terrains break out northwards as well? Hope I've not missed the point, if so then please put me straight. Cheers ---------------------------------------------------------------------------- ---- Craig Storey, Dept. of Geology, University of Leicester, Leicester, LE1 7RH Tel: (+44) 0116 252 3632 Fax: (+44) 0116 252 3918 Email [log in to unmask] http://www.le.ac.uk/geology/staff/glpgst.html ---------------------------------------------------------------------------- ----