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. This research was supported by a JOI/U.S. Science Advisory Committee grant (Dugan). Reviews and comments by P. Blum, D. Saffer, and E. Screaton strengthened the manuscript.