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Dear John Off the beaten track, but the Jurassic dykes are very well-exposed in the Falkland Islands, intruding Devonian quartzites and (to a lesser extent) Permian glacial and deltaic sediments. Good rock-cut platforms around the coasts. I do not know about South Africa, but it is possible that there are equally well-exposed examples in the Cape. With best wishes David <-<<--<<<--->>>-->>-> David Macdonald University of Aberdeen Meston Building Aberdeen AB24 3UE Tel: 01224-273451 Mobile: 07909-611775 E-mail: [log in to unmask] Web: http://www.abdn.ac.uk/geology/people/staffpages/dmacdonald/dmacdonald.php -----Original Message----- From: Tectonics & structural geology discussion list [mailto:[log in to unmask]] On Behalf Of John F. Dewey Sent: 12 September 2011 15:33 To: [log in to unmask] Subject: Re: Mafic dykes >_Dear Colleagues, I am seeking out 100% exposed marine rock platforms where mafic dykes and their wall structures, and, ideally, relay/transform offsets, and terminations can be studied. I am seeking places where dykes were injected laterally away from volcanic centres and places where dykes were injected vertically beneath volcanic centres. I have visited a few spots in Arran, Mull, and Skye but I am looking for a lot more. Any help and suggestions will be greatly appreciated. Best wishes, John >_____________________________________________________ > >________________________________________________________________________ > -- Please note that my email address has changed to: [log in to unmask] Prof. John F. Dewey FRS, M.R.I.A., FAA, Mem. Acad. Eur., Mem. US Nat. Acad. Sci., Distinguished Emeritus Professor University of California, Emeritus Professor and Supernumerary Fellow, University College Oxford. Sherwood Lodge, 93 Bagley Wood Road, Kennington, Oxford OX1 5NA, England, UK University College, High Street, Oxford OX1 4BH Telephone Nos: 011 44 (0)1865 735525 (home Oxford) 011 44 (0)1865 276792 (University College Oxford) The University of Aberdeen is a charity registered in Scotland, No SC013683.