Figure 3. Uninterpreted Multichannel seismic reflection (MCS) profile across the Faro- Albufeira drift on the middle slope (Line P74-75 provided by REPSOL Oil Company for the IODP proposal. Site GC-01A & GC-09A location is showed. Four major low-resolution depositional sequences have been recognised by MCS profiles in the Pliocene and Quaternary sedimentary record (Llave et al., 2001; Hernández-Molina et al., 2006). They are separated by four relevant discontinuities: M (Late Messinian), LPR (early Pliocene?), UPR (late Pliocene?) and MPR (Mid Pleistocene?). LPR erosive discontinuity could represent the onset of drift formation.