MURPHY, J. Brendan, Department of Earth Sciences, St. Francis Xavier University, Antigonish, NS B2G 2W5, Canada, bmurphy@stfx.ca and NANCE, R. Damian, Department of Geological Sciences, Ohio University, Athens, OH 45701

HATCHER, Robert D. Jr, Earth and Planetary Sciences and Science Alliance Center of Excellence, University of Tennessee-Knoxville, Knoxville, TN 37996, bobmap@utk.edu

RAINBIRD, Rob, Natural Resources Canada, Geological Survey of Canada, 601 Booth Street, Room 499, Ottawa, ON K1A 0E8 Canada, rrainbir@nrcan.gc.ca

BLEEKER, Wouter, Geological Survey Canada, 601 Booth St, Ottawa, ON K1A 0E8, Canada, wbleeker@gsc.nrcan.gc.ca and ERNST, Richard E., Dept. of Geology, Carleton University and Ernst Geosciences, 43 Margrave Avenue, Ottawa, ON K1T 3Y2, Canada

EVANS, David A.D., Department of Geology and Geophysics, Yale University, New Haven, CT 06520, david.evans@yale.edu, EGLINGTON, Bruce, Saskatchewan Isotope Laboratory, University of Saskatchewan, 114 Science Place, Saskatoon, SK K1Y 3L5, Canada, and PEHRSSON, Sally, Geological Survey of Canada, 601 Booth Street, Ottawa, ON K1A 0E8, Canada

NANCE, R. Damian, Department of Geological Sciences, Ohio University, Athens, OH 45701, nance@ohio.edu and MURPHY, J. Brendan, Department of Earth Sciences, St. Francis Xavier University, Antigonish, NS B2G 2W5, Canada

CONDIE, Kent, Department of Earth & Environmental Science, New Mexico Tech, Socorro, NM 87801, kcondie@nmt.edu

SINHA, A. Krishna, Geosciences, Virginia Tech, Blacksburg, VA 24061-0420, pitlab@vt.edu and HANAN, Barry B., Geological Sciences, San Diego State University, San Diego, CA 92182-1020

LUND, K., U.S. Geological Survey, MS 973, Denver Federal Center, Denver, CO 80225, klund@usgs.gov and ALEINIKOFF, J.N., U.S. Geological Survey, Denver Federal Center, MS 963, Denver, CO 80225

BRADLEY, Dwight C., U.S. Geological Survey, 4210 University Drive, Anchorage, AK 99508, dbradley@usgs.gov, MCCAULEY, A., USGS, 4210 University Drive, Anchorage, AK 99508, BUCHWALDT, R., Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Building 54-1126, Cambridge, MA 02139, SHEA, E.K., Dept. of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, and BOWRING, S., Dept. of Earth, Atmospheric & Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139

LOWMAN, Julian P., Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C 1A4, Canada, lowman@utsc.utoronto.ca and HERON, Philip J., Department of Physics, University of Toronto, 60 St. George St, Toronto, M5S 1A7

AUDET, Pascal, Earth Sciences, University of Ottawa, 223 Marion Hall, Ottawa, ON K1N 6N5 Canada, pascal.audet@uottawa.ca