LINDE, Gwen M., Geological Sciences, University of Nevada, Reno, NV 89557, CASHMAN, Patricia H., Geological Sciences, University of Nevada, Reno, Reno, NV 89557, DICKINSON, William R., Department of Geosciences, University of Arizona, Tucson, AZ 85721 and TREXLER, James H., Department of Geological Sciences and Engineering, University of Nevada, MS 172, 1664 N Virginia St, Reno, NV 89557, gwenlinde@yahoo.com