ROYER, Dana L., Department of Earth and Environmental Sciences, Wesleyan University, Middletown, CT 06459, droyer@wesleyan.edu, droyer@wesleyan.edu

GEHRELS, G.E., Department of Geosciences, University of Arizona, Tucson, AZ 85721, ggehrels@email.arizona.edu, ggehrels@email.arizona.edu

VALLEY, John W., Department of Geoscience, University of Wisconsin, 1215 West Dayton Street, Madison, WI 53706, valley@geology.wisc.edu, valley@geology.wisc.edu