Figure F1. Mole percentages of phospholipid fatty acids in Middle Valley sediments (this study), active sulfide flange (2°C on top, 350°C at the bottom; Hedrick et al., 1992), Piceance Basin sandstones and shales (40-200 m, Ringelberg et al., 1997), and Guaymas Basin sediments (t) and sulfides (r) (temperatures estimated at 30°-90°C; Guezennec et al., 1996).