Figure 6. Diagram showing the depth to the basement in the two Middle Valley holes that were instrumented with CORKs. Basement (shaded) at Site 857 is defined as the top of a sill-sediment complex at 470 mbsf. Basement under Site 858 rises to 250 mbsf and is extrusive basalt (from Davis and Becker, 1994a).
To 169 Figure 7
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