This study has been supported by National Science Foundation (NSF) grant OCE-0136500 to Douglas Hammond and an ODP Schlanger fellowship to Maria G. Prokopenko. The authors gratefully acknowledge members of the Scientific Party of Leg 202, who collected samples for us. We are also thankful to the Co-Chief Scientists of Leg 202, Drs. A. Mix and R. Tiedemann, for being very helpful in obtaining the samples, thus making this study possible. The technical assistance of M. Rincon and T. Gunderson at USC is greatly appreciated. This research used samples and/or data supplied by the Ocean Drilling Program (ODP). ODP is sponsored by U.S. National Science Foundation (NSF) and participating countries under management of Joint Oceanographic Institutions (JOI), Inc. Thoughtful suggestions by J. Brandes and the anonymous reviewer significantly improved this manuscript.