1. Department of Physical and Environmental Sciences University of Toronto 1265 Military Trail Scarborough ONM1C 1A4Canada
2. Ontario Geological Survey 933 Ramsey Lake Road Sudbury ONP3E 6B5Canada
3. Geological Survey of Canada 601 Booth Street Ottawa ONK1A 0E8Canada
4. British Geological SurveyThe Lyell Centre Research Avenue South EdinburghEH14 4APUK
5. Geological Survey of Finland PO Box 97FI‐67101Kokkola Finland