We thank R. Eagle for his support and advice, M. Hall and J. Rolfe for their invaluable technical help, B. Horan, P. Weiss, M. Lyle, and S. Hovan for their support, and H. Coxall for her comments on this manuscript. 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 to A. Tripati by the U.S. Science Support Program and by the Comer Foundation.