We gratefully acknowledge the help of our student analysts Ellen Unsworth, Debi Agenbroad, and Suzanne Shaub who ran the majority of the carbon analyses. This project was supported by JOI/USSP, and by NSF grants OCE-9634141 (Site Survey for Leg 167) and OCE-9811272 (millennial variations in California margin sediments). Samples from the piston cores were provided by the Oregon State University core laboratory (NSF Grant OCE-9712024).