The author thanks Jerry Bode of the West Coast Core Repository for his help in sampling DSDP cores as well as Phil Rumford and the staff of the Gulf Coast Repository for their help with ODP cores. This research used samples and data provided by the Ocean Drilling Program (ODP). The ODP is sponsored by the U.S. National Science Foundation (NSF) and participating countries under the management of Joint Oceanographic Institutions (JOI), Inc. Funding from JOI/USSSP supported the measurements and analyses.