Figure F2. Seismic reflection profile at Site 1220 (PAT-9D). The sedimentary section is marked by a weakly reflective unit ~37 ms two-way traveltime (TWT) below the seafloor, assumed to be clays. Deeper in the section, reflectors at approximately 53, 97, 193, and 283 ms TWT are interpreted as the P4, P3, P2 and basement seismic horizons, respectively (see Lyle et al., this volume).