This research used samples and data provided by the Ocean Drilling Program (ODP). ODP is sponsored by the U.S. National Science Foundation (NSF) and participating countries under management of Joint Oceanographic Institutions (JOI), Inc. This research was funded by a grant from JOI/U.S. Science Support Program. We wish to thank Matthew Salisbury and Junzo Kasahara for their helpful reviews. Alan Kobussen and Jon van Alstine helped with making many of the velocity measurements.