This research used samples and/or data supplied 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. This work was supported by the U.S. Science Support Program (user reference: 418920-BA372; task order F001602). Support for P. Bromirski was also provided by the California Department of Boating and Waterways and the California Energy Commission PIER Program through the California Climate Change Center at SIO.