Figure F6. Site survey MCS data (Hallenborg et al., 2003) from the lines that cross at Site 1256, with penetration as of the end of Expedition 309 scaled approximately to travel time. Distances are in kilometers. Horizontal reflectors in the upper basement to travel times of 5.5 s appear to result from contrasts between lava flow sequences, corresponding to depths of at least 800 meters subbasement.