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Sites 407 through 410 were investigated for their opal phytoplankton remains (Figure 1). Samples were prepared according to previously outlined procedures (Schrader and Fenner, 1976), and slides prepared after the standard method described in Schrader (1974). Each slide (18 × 18 mm) represented approximately 1/200 part of the original sample split. In order to present information about diatom content of individual samples, randomly distributed microscopic fields (15 × 10 μm) were laid over the slide; each diatom, whole or fragmented, was counted as one unit, and mean values of five counts are tabulated in Tables 1 through 4. This is intended as an initial study, not a detailed diatom study on these samples, so no detailed taxonomy or detailed information on the various biostratigraphic and paleoecologic aspects are presented. Further studies, specifically on the occurrence of Pliocene/Pleistocene diatoms, on Denticula seminae, Rhizosolenia curvirostrislR. barboi, and on the occurrence and causes, in

Opal Phytoplankton in DSDP Leg 49 Samples