REHEIS, Marith C., United States Geological Survey, Denver Federal Center, MS-980, Denver, CO 80225, mreheis@usgs.gov

BIERMAN, Paul R., Geology Department and Rubenstein School of Environment and Natural Resources, University of Vermont, Delehanty Hall, 180 Colchester Ave, Burlington, VT 05405, pbierman@uvm.edu

DETHIER, David P., Dept. Geosciences, Williams College, 947 Main Street, Williamstown, MA 01267, ddethier@williams.edu and BIRKELAND, Pete, University of Colorado

WOHL, Ellen, Geosciences, Colorado State University, na, Fort Collins, CO 80523-1482, ellen.wohl@colostate.edu

CLARK, Peter U., College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331-5506, clarkp@onid.orst.edu

ANDERSON, Robert S., Department of Geological Sciences and INSTAAR, University of Colorado, Boulder, CO 80309, Robert.S.Anderson@colorado.edu, ANDERSON, Leif, Department of Geological Sciences, INSTAAR, University of Colorado, Boulder, CO 80309, DUHNFORTH, Miriam, Department of Earth and Environmental Sciences, Ludwig-Maximilian University (LMU) Munich, Munich, 80333, Germany, and COLGAN, William, Geological Survey of Denmark and Greenland, ุster Voldgade 10, Copenhagen, DK-1350, Denmark

MUHS, Daniel R., U.S. Geological Survey, MS 980, Box 25046, Federal Center, Denver, CO 80225, dmuhs@usgs.gov