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| Journal of the Geological Society |
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Discussion Paper |
1 16 Neville Square, Durham DH1 3PY, UK (e-mail: r.w.c.westaway@ncl.ac.uk)
2 Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK (e-mail: alastair.robertson@glg.ed.ac.uk)
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