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Figure F5. Evolution of oxygen stable isotope (¹⁸O) through the Cenozoic and related major phases of climate change (modified from Zachos et al., 2001b). Time slices of interest for the Pacific equatorial age transect (PEAT) cruises are marked as yellow boxes labeled with the proposed site name. Green and blue boxes refer to ODP legs and sites previously drilled in the equatorial Pacific region; these additional sites will be used with the proposed PEAT sites to obtain a nearly continuous Cenozoic record of the equatorial Pacific region. Oi-1 = Oligocene isotopic event 1, Mi-1 = Miocene isotopic event 1 (both as described in Miller et al., 1991). VPDB = Vienna Peedee belemnite.

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