Figure 173-2. Composite seismic time section created from the track segments of, from west to east, the Sonne, JOIDES Resolution and Lusigal profiles shown in Fig. 1. The irregular surface is the top of the acoustic basement. Basement was sampled at Sites 897, 899, and 900 during Leg 149. The nature of basement (oceanic, transitional, extended continental) is indicated; at Site 901 it is inferred. Proposed Sites Iberia 7A, Iberia 8A/8B, Iberia 9A/9B and Iberia 10A are also indicated. Iberia 7A lies slightly to the north of this profile.