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We present an overview of the Eocene-Oligocene transition from a marine perspective and posit that growth of a continent-scale Antarctic ice sheet (25 × 106 km3) was a primary cause of a dramatic reorganization of ocean circulation and chemistry. The Eocene-Oligocene transition (EOT) was the culmination of long-term (107 yr drawdown and related cooling that triggered a 0.5‰–0.9‰ transient pre-scale) CO2 cursor benthic foraminiferal δ18O increase at 33.80 Ma (EOT-1), a 0.8‰ δ18O increase at 33.63 Ma (EOT-2), and a 1.0‰ δ18O increase at 33.55 Ma (oxygen isotope event...

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