Figure AF9. Multichannel seismic (MCS) reflection profile (Line HE91-20) across the sheeted drifts showing the location of proposed Site GC-11A (MCS lines provided by REPSOL Oil Company). Four major low-resolution depositional sequences have been recognized in the Pliocene and Quaternary sedimentary record (Llave et al., 2001; Hernández-Molina et al., 2002, 2006) and are separated by four relevant discontinuities: LPR (early Pliocene?), QBD (base of the Quaternary?) and MPR (mid-Pleistocene?). LPR erosive discontinuity could represent the onset of drift formation. TWT = two-way traveltime.
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