This research used samples and/or data provided by the Ocean Drilling Program (ODP). ODP is sponsored by the U.S. National Science Foundation (NSF) and participating countries under management of Joint Oceanographic Institutions (JOI), Inc. Funding for this research was provided by the U.S. Science Support Program of JOI. We also thank Dr. Mark Wiesner and Dr. Jonathan Brant of the Rice University Civil and Environmental Engineering Department for Coulter Multisizer use and Dr. Leah Joseph for helpful procedural and analytical comments.