Figure F9. Seven-point smoothed elemental ratios and total Ba concentrations at Site 1090 showing an important change in terrigenous and biogenous sedimentation across the Eocene/Oligocene boundary that were interpreted to be related to the opening of the Drake Passage (after Latimer and Filippelli, 2002). A. Al/Ti. B. P/Al. C. Ba/Al. D. Ba.