Fig. 9. (A) TWT map to the top of PR1 surface (Cretaceous_¯Eocene arc rocks) with a contour interval of 200 ms. Identification of the top of PR1 in the shallow-water southwestern and southeastern parts of the study area was not possible because the reflection profiles are obscured by the sea floor multiple. The main structural features affecting the top of PR1 include the San Juan high and the outer ridge, which is shown in cross section on Line 8 in Fig. 6. Dip symbols indicate main dip direction of PR1 surface. (B) Isotime map with 100 ms contour interval of PR2. The main depocenter of this sequence in the forearc basin appears to be in the shallow-water southwestern corner of the study area, where EW96-05 was insufficient to resolve the thickness of the megasequence, because of the sea floor multiple.

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