This research used samples and/or data provided by the Ocean Drilling Program (ODP). ODP is funded by the U.S. National Science Foundation (NSF) and participating countries under management of Joint Oceanographic Institutions (JOI), Inc. This study was partly funded by JOI United States Science Support Program (JOI-USSSP). We thank Leg 205 Co-Chief Scientists J.D. Morris and H. Villinger, ODP Staff Scientist Adam Klaus, and the Scientific Party of Leg 205 for their support of our shore-based research. We also thank R. Lutz for providing most of the Site 1040 samples and J. Firth for his help in procuring Leg 205 sediments from the ODP Gulf Coast Core Repository (College Station, Texas). We acknowledge extremely useful communications with Dave Scholl, Don Fisher, Eli Silver, and Kirk McIntosh that helped us shape the interpretations sections of this manuscript. Any errors in these sections are, of course, solely our responsibility. Finally, we thank Peter Clift and Jeff Ryan for their constructive reviews and Julie Morris for her editorial handling of this manuscript.