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Figure 37--For column 21 in this image, tight compression of units in the 'gap' continues and the Tacoma basin sedimentary rocks (blue) continue to be delineated. Velocities of units forced into the 'gap' are >6.5 km/s, which is at the upper limit for deeply metamorphosed sedimentary rocks; therefore, most of the material now in the gap may be equivalent to Crescent Fm. basalts