1. Professor of Geology and Environmental Science, Dept. of Geological and Environmental Sciences, Hope College, P.O. Box 9000, Holland, MI 49422-9000 (corresponding author).
2. Undergraduate Student, Dept. of Engineering, Hope College, P.O. Box 9000, Holland, MI 49422-9000.
3. Professor of Chemistry, Dept. of Chemistry, Hope College, P.O. Box 9000, Holland, MI 49422-9000.
4. Undergraduate Student, Dept. of Geological and Environmental Sciences, Hope College, P.O. Box 9000, Holland, MI 49422-9000.