We thank Indrigit Roy for the use of his seismic inversion algorithm and his efforts to implement it on our data. We thank Julia Morgan and an anonymous reviewer for thoughtful and detailed comments that helped this manuscript significantly. This research used samples and/or 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 the Joint Oceanographic Institutions (JOI) Inc. This work was supported by NSF grant number OCE-9730637 and the United States Science Support Program. This manuscript represents UTIG contribution number 1692.