I am grateful for the effort and support of the scientific party, technical staff and crew of Ocean Drilling Program Leg 170. It has been a great privilege to carry out postcruise science with my close coworkers, including Miriam Kastner, Kirk McIntosh, Andy Fisher, Demian Saffer, and Julie Morris. I am especially grateful to have had the opportunity to work with Mark Langseth prior to Leg 170. His foresight has played a key role in our work. I thank Joris Gieskes and Gail Christeson for helpful reviews. This work was supported by the generosity of the JOI/US Science Support Program, through co-chief scientist support and grant 170-F000511.