The event indicative of the change from the Pseudoeunotia doliolus Zone (0-0.69 Ma) to the Nitzschia reinholdii Zone (0.69-1.88 Ma), the last occurrence of N. reinholdii, was not observed within this study. This species is present, but because of the rarity of the specimens within each sample and the sparsity of their occurrences biostratigraphically, these are thought to be reworked, placing the interval examined here entirely within the P. doliolus Zone. The biostratigraphy utilized during this cruise is presented in Keigwin, Rio, Acton, et al., 1998. All of the diatom data gathered from these four cores is presented in Tables T1, T2, T3, and T4.