1. Department of Geological Sciences; Indiana University; 1001 East 10th Street Bloomington IN 47405 USA
2. US Geological Survey; 12201 Sunrise Valley Drive Reston VA 20192 USA
3. Department of Natural Resources; Alaska Division of Geological & Geophysical Surveys (DGGS); 3354 College Road Fairbanks AK 99709 USA
4. Department of Geology; State University of New York at Potsdam; Potsdam NY 13676 USA
5. US Geological Survey; 87 State Street Montpelier VT 05602 USA