Figure F11. Comparison of benthic delta13C signals between the deep Pacific Site 849 (blue dashed line) (Mix et al., 1995), Southern Ocean Site 1090 (red line, solid circles) (Venz and Hodell, 2002) and Site 1092 (red line, open circles) (Andersson et al., 2002) and North Atlantic Site 607 (black line) (Raymo et al., 1990, 1992). Note that Southern Ocean benthic delta13C values decreased in two pronounced steps at 2.75 and 1.55 Ma relative to records in the North Atlantic and Pacific Oceans. At 2.75 Ma, Southern Ocean delta13C values shift away from the North Atlantic and overlap those in the Pacific. After 1.55 Ma, Southern Ocean delta13C values were consistently lower than those in the Pacific during glacial periods.

Figure F11. Comparison of benthic

¹³C signals between the deep Pacific Site 849 (blue dashed line) (Mix et al., 1995), Southern Ocean Site 1090 (red line, solid circles) (Venz and Hodell, 2002) and Site 1092 (red line, open circles) (Andersson et al., 2002) and North Atlantic Site 607 (black line) (Raymo et al., 1990, 1992). Note that Southern Ocean benthic

¹³C values decreased in two pronounced steps at 2.75 and 1.55 Ma relative to records in the North Atlantic and Pacific Oceans. At 2.75 Ma, Southern Ocean

¹³C values shift away from the North Atlantic and overlap those in the Pacific. After 1.55 Ma, Southern Ocean

¹³C values were consistently lower than those in the Pacific during glacial periods.