We would like to acknowledge T. Sowers for use of his gas chromatograph and M.A. Bruns, J. Moran, V. Miteva, L. Corbett, and members of the Brenchley and House laboratories for assistance. 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 Joint Oceanographic Institutions (JOI), Inc. Funding for this research was provided by the Pennsylvania State University Astrobiology Research Center (through the US National Aeronautics and Space Administration Astrobiology Institute), Department of Energy (DOE) grant DE-FG02-93ER20117, and by JOI. JFB was supported by the Pennsylvania State Biogeochemical Research Initiative for Education (BRIE) funded by NSF (IGERT) grant DGE-9972759 and by a Schlanger ODP fellowship from JOI.