The authors wish to thank Dr. David M. Harwood for his long-distance assistance, discussions in preparation of this manuscript, and thorough review of the final manuscript. Comments and suggestions from Drs. Jason Whitehead and Patrick G. Quilty greatly improved the final manuscript. Dr. Hans Schrader provided valuable criticism of early drafts of this paper. This paper was written for a Southern Ocean Cenozoic Diatom Biostratigraphy course at Florida State University given by Dr. Sherwood W. Wise Jr. 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. This study was supported by USSAC funds to S.W. Wise Jr. Laboratory facilities were provided by NSF grant number DPP 94-22893.