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Figure F4. Summary lithostratigraphic column of the basement drilled to date at Site 1256 showing recovery; major lithologies; downcore index alteration mineral distribution (thick lines = abundant; thin lines = rare); downcore distribution of Mg# (where Mg# = 100 × Mg/[Mg + 0.9 × Fe]) atomic ratio; symbols as in Fig. F10); and seismic velocity measured on discrete samples, wireline tools, and seismic refraction (from Wilson et al., 2003). Heavy red and orange lines show the inversion of traveltimes from Leg 206 and Expedition 312 vertical seismic profiles (VSP), respectively (Swift et al., 2008).

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