Alexandre Normandeau, Geological Survey of Canada Atlantic, Dartmouth, NS, Canada, Pierre Dietrich, Department of Geology,University of Johannesburg, Johannesburg, South Africa, Johannesburg, South Africa, John Hughes Clarke, University of New Hampshire, Durham, United States, Wesley D Van Wychen, Organization Not Listed, Washington, DC, United States, Patrick Lajeunesse, Centre d'études nordiques and Université Laval, Géographie, Québec, QC, Canada, David O Burgess, Natural Resources Canada, Ottawa, ON, Canada and Jean-François Ghienne, University of Strasbourg, IPGS-EOST, CNRS-UMR 7516, Strasbourg, France