Figure 2. Schematic cross section across the Iberia Margin with Leg 149 site locations, sediment distribution, and inferred basement lithology and configuration, modified from Whitmarsh et al. (1994). This composite section was constructed using a series of seismic lines along a transect of the Leg 149 sites. Symbols reflect the variable basement lithology across the margin. The westernmost part of the section is underlain by oceanic crust. Drilling results indicate that Sites 897 and 899 are underlain by serpentinized peridotite (upper mantle), whereas Site 900 is underlain by sheared gabbro with mid-oceanic-ridge-basalt affinities. The Jurassic pre- or synrift sedimentary rocks recovered at Site 901 most likely overlie extended continental crust.