I wish to thank Dr. Mike Jackson at the University of Minnesota (UMN) Institute for Rock Magnetism (IRM) for his scientific and technical assistance, and the IRM for use of the AMS instruments. Roberta Bloss (UMN) conducted many of the AMS analyses, and Dr. Suzanne O'Connell (Wesleyan University) directed the carbonate analyses. Funding for this project was provided by the Joint Oceanographic Institutions/U.S. Science Support Program. Samples were provided by ODP with the assistance of the Leg 172 Shipboard Scientific Party, technicians, and crew.