Figure 1B. Bathymetry of the Middle Valley (Davis and Villinger, 1992) shown as contours drawn at 10 m intervals. Areas of proposed drilling sites are the Dead Dog vent field (Site 858, DD1-4) in the area of active venting and Bent Hill (Site 856, BH1-6, BH8). Modifed from Mottl, Davis, Fisher, and Slack, (Eds.), 1994 .