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Figure 18--Continuation of the Tacoma basin and development of the Olympic Mts. section of the accretionary prism are shown in this section from row 20. The steep dip of the JDFP below the mafic wedge is hidden in this view, but can be seen in 2D form. A section of Crescent Fm. intrudes into the thick accretionary prism complex in the Olympic Mts. on the west end of the section.