We are grateful to Drs. Haraldur Sigurdsson, R. Mark Leckie, Gary D. Acton, William P. Chaisson, Steven L. D'Hondt, and other shipboard scientists on Leg 165 who provided encouragement, friendship, and valuable advice. We are also grateful to Drs. Katharina von Salis Perch-Nielsen and Isabella Raffi for constructive reviews of this paper.