Figure F7. Plate tectonic backtrack of Leg 202 and Leg 138 drill sites (Mix, Tiedemann, Blum, et al., 2003). Large circles = modern location, successive circles = backtrack position relative to South America (t = 1-m.y. intervals). EQ = Equator, NECC = North Equatorial Counter Current, EUC = Equatorial Undercurrent, SEC = South Equatorial Current, HC = Humboldt Current, SST = sea-surface temperature.