1. Geological Survey of Canada; 3303-33rd St NW Calgary Alberta T2L 2A7 Canada
2. Department of Geological Sciences; University of Saskatchewan; Saskatoon Saskatchewan S7N 5E2 Canada
3. Geological Survey of Canada; 490 de la Couronne Québec Québec G1K 9A9 Canada
4. Geological Survey of Canada; 601 Booth Street Ottawa Ontario K1A 0E8 Canada