GUNN, Heather, Department of Earth & Environmental Sciences, Syracuse University, 900 S Crouse Ave, Syracuse, NY 13210; The Jackson School of Geosciences, The University of Texas at Austin, 23 San Jacinto Blvd, Austin, TX 78712, MILLER, Nathan, Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX 78712, BANNER, Jay L., Geosciences, University of Texas at Austin, Austin, TX 78705 and ORLANDINI, Omero F., Department of Geological Sciences, The University of Texas at Austin, Austin, TX 78745