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DSDP Leg 29 began on 2 March 1973 at Lyttleton, New Zealand, and ended on 18 April 1973 at Wellington, New Zealand. During the cruise, 16 holes were drilled in the area south of Australia and New Zealand and in the Tasman Sea (from 40° to 56°S and 143° to 178°E; see Figure 1). The present report is an evaluation of the upper Eocene-lower Oligocene diatom assemblages of 27 samples from 18 cores taken at Sites 280 (in deep water south of the South Tasman Rise), 281 (in shallow water, on the South Tasman Rise), and 283 (Central Tasman Sea). The diatoms, archaeomonads, and silicoflagellates were studied, and photographs taken, using an Amplival binocular light microscope with 40× and 100X objectives and lO× and 16× oculars. Diatoms are the principal biostratigraphic indicators in the siliceous sediments because of their abundance and good preservation; foraminifers and nannofossils occur in subordinate numbers or are absent. For more precise stratigraphic control and for paleoenvironmental purposes, the entire siliceous microfossil assemblage was studied. The distribution of siliceous microfossils in Leg 29 sediments is shown in Table 1, and the frequency distribution of characteristic species is shown in Figure 2. The following section summarizes the occurrence of siliceous microfossils at all sites drilled during Leg 29.

Upper Eocene and Lower Oligocene Diatomaceae, Archaeomonadaceae, and Silicoflagellatae in Southwestern Pacific Sediments, DSDP Leg 29