171B Preliminary Report Figures

Figure 7. Susceptibility and color across the Paleocene/Eocene interval at Site 1049 displays what may be a precessional orbital cycle. The wavelength of the cycles in the Eocene (average sedimentation rate 25 m/m.y.) is consistent with an obliquity signal, whereas those in the Paleocene (average sedimentation rate 18 m/m.y.) are consistent with a precession signal. The change in the wavelength of the cyclicity across the Paleocene/Eocene boundary suggests that both a change in the response of the climate system from precession to obliquity control and an increase in long-term sedimentation rates occurred close to the Paleocene/Eocene boundary. Mcd = meters composite depth.

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