RESULTS

The data are given in Tables T1, T2, T3, T4, T5, T6, T7, T8, and T9 and Figures F2, F3, F4, F5, F6, F7, F8, F9, and F10. Tables T1, T2, and T3 refer to Site 1095; downcore plots for this site are shown by Pudsey (Chap 25, this volume).

Tables T4, T5, and T6 and Figures F2, F3, F4, and F5 refer to Site 1096. Diatom content is generally low (<10%), reflecting dilution by the abundant fine-grained terrigenous supply to this site at the inshore end of Drift 7. The spikiness of the sand percentage and other grain-size data result from sampling the lithologic cycles that are present throughout the section (Shipboard Scientific Party, 1999b). Virtually all the sand is terrigenous. Clay content is generally very high (70%-80% finer than 4 µm); the samples are poorly to very poorly sorted and positively (fine) skewed.

Tables T7, T8, and T9 and Figures F6, F7, F8, and F9 refer to Site 1101. Diatom content is generally low in the Quaternary but up to 38% in the upper Pliocene. Some of the sand in the samples from 50 to 135 meters below seafloor (mbsf) (0.7-2.0 Ma) comprises foraminiferal tests (Wolf-Welling, Chap 15, this volume). The fine-fraction grain-size data (Fig. F8) emphasize the strong lithologic cyclicity, with silty clays and clayey silts alternating. Most median and many of the modal diameters are in the silt rather than the clay range. Sorting is poor and the samples are positively (fine) skewed.

None of the sites shows any marked trends in grain size downcore, but there are significant differences between sites. Figure F10 shows frequency histograms of median diameter and mode for each site. Note that not all samples have a well-defined mode. Approximately one-third of the samples from Sites 1095 and 1096 and 10% of those from Site 1101 are polymodal or so poorly sorted that a mode could not be picked. At Site 1095, median diameter average = 9.65 and most modes are near 8 (silt/clay boundary), with a few in the silt range. At Site 1096, median diameter average = 10.3 and nearly all modes are ~8 . Site 1101 has a much wider spread of median and modal diameters. It is likely that Site 1096 represents the lowest-energy hemipelagic environment with the weakest bottom currents. Some samples at Site 1095 include a silt component from turbidity currents (Pudsey, submitted, this volume). Site 1101 is a hemipelagic/contouritic section (Shipboard Scientific Party, 1999c), reflecting some sorting by bottom currents.