Comments from Barry Katz and Ralf Littke helped to improve this contribution. We deeply appreciate the experience, knowledge, and good humor of Phil Rumford, Chieh Peng, and Eric Meissner in producing the organic carbon and Rock-Eval analytical results. The graphical skills of Dale Austin converted our crude figures into scientific art. We thank the Ocean Drilling Program, funded by the National Science Foundation and IPOD countries, for providing us with the special and oddly enjoyable opportunity to spend two months at sea. Postcruise studies of PAM were supported by a grant from JOI-USSSP.