We wish to thank the Master and crew of JOIDES Resolution for Leg 168, the Ocean Drilling Program personnel, and the other members of the shipboard scientific party, all of whom worked together to make Leg 168 a success. Chris Fleisher assisted in electron microprobe analysis at the University of Georgia, Crawford Elliott helped with X-ray diffraction analyses at Georgia State, and Michelle Shearer assisted in sample preparation. This study was supported through a JOI/USSAC grant as well as ICP-MS support from the National Science Foundation (EAR-9405716 and EAR-950623). We thank D.R. Peacor, R. Mühe, and C. Escutia for helpful reviews of the original manuscript.