DAMERON, Serena1, LECKIE, Robert2, POLYAK, Desiree3, ROBINSON, Libby J.4, WHITESIDE, Jessica H.4, ELDER, Will5 and LEITHOLD, Lonnie6, (1)Department of Geosciences, University of Massachusetts Amherst, 627 North Pleasant Street, 233 Morrill Science Center, Amherst, MA 01003, (2)Department of Geosciences, University of Massachusetts Amherst, 627 N Pleasant St, Amherst, MA 01003-9298, (3)National Minerals Information Center, USGS, Reston, VA 20192, (4)Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, SO14 3ZH, United Kingdom, (5)Golden Gate National Recreation Area, U.S. National Park Service, Fort Mason, Building 201, San Francisco, CA 94123, (6)Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695