We thank William Balsam, Sara Harris, and Joseph Ortiz for helpful discussions regarding the use of reflectance data in estimating mineralogical components. Suzanne O'Connell and Sara Harris are thanked for their reviews. Thanks to Pat Malone (Lamont-Doherty Earth Observatory) for performing carbonate analyses. Many thanks to the sedimentology team for collecting the reflectance data and to the Leg 172 crew and scientific party for a successful venture at sea. This work was supported by a USSSP grant.