CONCLUSIONS

1. The terrigenous component at Sites 1018 and 1020 is dominated by hemipelagic transport and drift depositional processes throughout the late Pleistocene. Terrigenous mass flux records are closely linked to orbital-scale variability and show increased input during times of increased ¹⁸O (glacial), indicating increased supply from the source region that may be associated with increased erosional supply, either from greater exposure of shelf regions during lower sea levels, increased fluvial discharge from wetter regional source areas during these intervals, or a combination of both.
2. Detailed grain-size analysis can help distinguish the relative contribution of different terrigenous mineral transport/depositional processes and suggests that higher energy regimes were associated with sediment deposits at Site 1018, whereas Site 1020 sediments were dominated by lower energy hemipelagic processes. Average grain-size distributions within each site are nearly identical during glacial and interglacial intervals, indicating little difference between the energy of transport and depositional processes at those times.
3. Clay mineralogy patterns suggest that periods of increased terrigenous input can be explained by transport of materials primarily from source regions similar to Central and Northern California.