[1] Geography College of Life and Environmental Sciences, University of Exeter, Rennes Drive, Exeter
[2] Department of Animal andPlant Sciences, University of Sheffield, Western Bank, Sheffield
[3] School of GeoSciences, University of Edinburgh, Edinburgh
[4] NERC Radiocarbon Facility, Scottish Enterprise Technology Park, Rankine Avenue, East Kilbride
[5] Department of Geography, University of Sussex, Brighton
[6] Northwest Territories Geological Survey, Government of the Northwest Territories, Yellowknife, Northwest Territories
[7] Department of Geography and Environmental Studies, Carleton University, Ottawa, K1S 5B6, ON
[8] Geological Survey of Canada, Natural Resources Canada, Ottawa, K1A 0E8, ON
[9] Department of Geography Environment and Geomatics, University of Ottawa, Ottawa, K1N 6N5, ON
[10] Department of Renewable Resources, University of Alberta, Edmonton, T6G 2H1, AB