Core identification, GPS locations, length, and elevations for cores were entered into Excel file. Elevations of cores were extracted using the extract values to points tool in ESRI ArgGIS Version 10.0.2.3200 from bathymetric grid (same USGS project)(Buster, N.A., Pfeiffer, W.R, Miselis, J.L, Kindinger, J.L., Wiese, D.S., and Reynolds, B.J., 2012, Bathymetry and acoustic backscatter data collected in 2010 from Cat Island, Mississippi: U.S. Geological Survey Data Series 739, available at
http://pubs.usgs.gov/ds/739/ and Smith, K.E.L., Nayegandhi, Amar, Wright, C.W., Bonisteel, J.M., and Brock, J.C., 2009, EAARL coastal topography – Northern Gulf of Mexico, 2007: Bare Earth: U.S. Geological Survey Data Series 400, available at
http://pubs.usgs.gov/ds/400/.)