PRUITT, Aaron H., Department of Geoscience, University of Wisconsin-Madison, 1215 W Dayton St, Madison, WI 53706, ahpruitt@wisc.edu, BRADBURY, Kenneth R., Wisconsin Geological and Natural History Survey, University of Wisconsin-Extension, 3817 Mineral Point Rd, Madison, WI 53705, and BAHR, Jean M., Department of Geoscience, University of Wisconsin, 1215 W. Dayton St, Madison, WI 53706