We thank the crew and technical staff of JOIDES Resolution for their help in obtaining the samples used in this study. Brandon Gomer and Amanda Cavin assisted in the laboratory. This paper represents the distillation of a M.S. thesis completed by Kimberly (Saettler) Hoke. Funding was provided by the U.S. Science Support Program, Grant 168-F000503. Richard Behl provided a helpful review of the manuscript.