This research used samples and/or data provided by Ocean Drilling Program (ODP). ODP is sponsored by the U.S. National Science Foundation (NSF) and participating countries under management of Joint Oceanic Institutions (JOI), Inc. Funding for this research was provided by JOI/USSP grant No. 26-3900-66. Other shipboard participants generously shared carbonate data, which they collected during postcruise research. L. Joseph contributed carbonate data for Sites 1122 and 1124. J. Rinna was the first to provide carbonate data analyzed from Site 1122. I. Hall allowed the use of carbonate data collected from Site 1123. K. Grant supplied data collected from Site 1125. The authors are grateful for their invaluable assistance, without which these models would only be sparsely anchored to the truth. Other persons who made significant contributions to this endeavor include Karen Graber, Phil Rumford, and the ODP GCR laboratory staff.