We appreciate Gary Acton for his review of this manuscript prior to submission. We also acknowledge Tony Ramsay, Bryan C. Ladner, and Chris Miller for their critical reviews.
This research used samples an/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 Monbusyo (Ministry of Education, Science, Sports, and Culture in Japan), and Kochi University.