We are grateful to A. Tréhu and G. Bohrmann for the organization of Leg 204, to the shipboard party for providing the samples from this cruise, and to E. Gracia and the other organizers for the splendid post-cruise conference in Barcelona. We thank G. Snyder for help during the sample preparation and Y. Muramatsu and R. Matsumoto for making unpublished data available. We appreciate the work by D. Elmore, M. Caffee, and colleagues on the 129I determinations at PrimeLab, Purdue University (West Lafayette, Indiana, USA). Thoughtful reviews by P. Santschi, M. Torres, and an anonymous reviewer are gratefully acknowledged. This research used samples and 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 JOI-ODP F001703.