Figure 4. A schematic of the equatorial sediment bulge from seismic lines taken during the Leg 199 site survey cruise (EW9709). Note how the early Eocene section thickens north of the predicted early Eocene equatorial position. The Miocene stratigraphy is based upon Mayer et al. (1985) constrained at the surface by sediment cores. The Eocene seismic stratigraphy is based upon our best estimates but with no real age control. Leg 199 drilling will test the model shown here and in Figure 5. TWTT = two-way traveltime.