Frontispiece. Cataclastic breccia typical of the shallow acoustic basement on the Iberia Abyssal Plain margin. This sample (Interval 149-897C-64R-4, 55-65 cm) is from Site 897 and consists of angular blocks of serpentinized peridotite in a serpentine and calcite matrix.

Locations of Leg 149 (and Site 398 of Leg 47B) superimposed on a magnetic anomaly contour chart of the Iberia Abyssal Plain (P.R. Miles, J. Verhoef, and R. Macnab, pers. comm., 1993). The anomalies have been reduced to the pole so that the location of an anomaly approximates the location of the source rock. Contour interval 25 nT, contour range +500 (lightest gray) to -250 nT (darkest gray). The large anomaly at about 13°10'W is anomaly J; the east side of the linear concave-to-the-west negative anomaly at 12°40'W probably represents the trace of the peridotite basement ridge drilled at Site 897.