ROSS, Martin, Earth and Environmental Sciences, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1 Canada, maross@uwaterloo.ca

BURKE, Helen, British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG United Kingdom, hbu@bgs.ac.uk

RUSSELL, H.A.J.¹, CUMMINGS, Don I.², PUGIN, A.M¹, and SHARPE, D.R.¹, (1) Natural Resources Canada, Geological Survey of Canada, 601 Booth St, Ottawa, ON K1A 0E8, Canada, HRussell@NRCan.gc.ca, (2) DC Geoscience, 12 Rue Décarie, Gatineau, QC QC J9H 2M3, Canada

THOMASON, Jason F., Illinois State Geological Survey, University of Illinois Urbana-Champaign, 615 E. Peabody Dr, Champaign, IL 61820, jthomaso@illinois.edu and KEEFER, Donald A., Illinois State Geological Survey, Prairie Research Institute, University of Illinois, 615 E. Peabody Dr, Champaign, IL 61820

MÄKINEN, Joni K., Geography, University of Turku, Turku, 20014, Finland, jonmak@utu.fi and ARTIMO, Aki P., Turku Region Water Ltd, Maariankatu 1, Turku, 20100, Finland

CARON, Olivier, Quaternary and Engineering Geology Section, Illinois State Geological Survey, 615 E. Peabody Drive, Champaign, IL 61820, caron@illinois.edu, LAMOTHE, Michel, Département des Sciences de la Terre et de l'Atmosphère, Université du Québec à Montréal, CP 8888 Centre-ville, Montréal, QC H3C 3P8, Canada, and SHILTS, William W., Prairie Research Institute, 615 E. Peabody Drive, MC-650, Champaign, IL 61820

CANNIA, James, Nebraska Water Science Center, U.S. Geological Survey, 130360 cr D, Mitchell, NE 69357, jcannia@usgs.gov, ABRAHAM, Jared D., U.S. Geological Survey, Box 25046, M.S. 964, Denver Federal Center, Denver, CO 80225-0046, SMITH, Bruce D., U.S. Geological Survey, Denver Federal Center, Bld 20, ms964, Lakewood, CO 80225, and LUNDSTROM, Scott C., U.S. Geological Survey, Geology and Environmental Change Science Center, P.O. Box 25046, DFC, MS 980, Denver, CO 80225

PARENT, Michel, Natural Resources Canada, Geological Survey of Canada, 490, de la Couronne, Québec, QC G1K 9A9 Canada, miparent@NRCan.gc.ca

MULLIGAN, Riley P.M., School of Geography and Earth Science, McMaster University, 1280 Main St. West, Hamilton, ON L8S 4K1, Canada, mulligrp@mcmaster.ca, EYLES, Carolyn H., School of Geography and Earth Sciences, McMaster University, Hamilton, ON L8S 4K1, and BAJC, Andy F., Ontario Geological Survey, 933 Ramsey Lake Road, Sudbury, ON P3E 6B5, Canada

LEBLANC, Yves¹, PARENT, Michel², LÉGARÉ, Guillaume¹, CAMPEAU, Stéphane¹, and PUGIN, André³, (1) Universite du Quebec a Trois-Rivieres, C.P. 500, Trois-Rivieres, QC G9A5H7, Canada, yves.leblanc1@uqtr.ca, (2) Natural Resources Canada, Geological Survey of Canada, 490, de la Couronne, Québec, QC G1K 9A9, Canada, (3) Geological Survey of Canada, 601 Booth Street, Ottawa, ON K1A 0E8, Canada

SEYOUM, Wondwosen Mekonnen, Department of Geology, University of Georgia, 308 Geography-Geology Building, Off. 122, Athens, GA 30602, seyoum@uga.edu and ECKSTEIN, Yoram, Department of Geology, Kent State University, McGilvrey Hall, Kent, OH 44242

DUNKLE, Kallina M., Department of Geosciences, Austin Peay State University, Clarksville, TN 37044, dunklek@apsu.edu, HART, David J., Wisconsin Geological and Natural History Survey, University of Wisconsin-Extension, 3817 Mineral Point Rd, Madison, WI 53705, and ANDERSON, Mary P., Geoscience, University of Wisconsin-Madison, 1215 W Dayton St, Madison, WI 53706-1692

LEMKE, Lawrence D., Department of Geology, Wayne State University, 0224 Old Main, 4841 Cass, Detroit, MI 48202, ldlemke@wayne.edu, PAPPAS, Lena K., Dept. of Geology, Wayne State University, 0224 Old Main, 4841 Cass, Detroit, MI 48202, and FRAHM, Andrew L., Dept. of Geology, Wayne State University, 0224 Old Main, 4841 Cass Ave, Detroit, MI 48202