CANNON, William F., U.S. Geol Survey, MS 954, Reston, VA 22092, ANDERSON, Raymond R., Iowa Geol Survey, 109 Trowbridge Hall, Iowa City, IA 52242-1319, CHANDLER, Val, Minnesota Geological Survey, 2609 Territorial Road, St. Paul, MN 55114, DANIELS, David L., U.S. Geol Survey, 954 National Center, Reston, VA 20192, HOLM, Daniel, Department of Geology, Kent State Univ, Kent, OH 44242, SCHNEIDER, David A., Geological Sciences, Ohio Univ, Clippinger Labs 316, Athens, OH 45701, SCHULZ, Klaus J., U.S. Geological Survey, 954 National Center, Reston, VA 20192 and VAN SCHMUS, W. Randall, Univ Kansas, 120 Lindley Hall, Lawrence, KS 66045-2124, wcannon@usgs.gov, wcannon@usgs.gov