Alejandro Fernandez, University of Minnesota Duluth, Duluth, MN, United States, Byron A Steinman, University of Minnesota Duluth, Department of Earth and Environmental Sciences and Large Lakes Observatory, Duluth, MN, United States, Nathan Stansell, Northern Illinois University, Geology and Environmental Geosciences, Dekalb, IL, United States and Mark B Abbott, University of Pittsburgh, Department of Geology and Environmental Science, Pittsburgh, PA, United States