Figure F2. Conceptual regional cross section through time across Site 1172, west and southwest from the Tasman Sea oceanic crust, across the East Tasman Plateau, and onto the abyssal plain between it and the South Tasman Rise, based loosely on seismic profiles AGSO 125-03 and -04 and 202-01 and -13 and limited other geological information (Exon et al., 1997) and information from Site 1172 drilling. Note the formation of oceanic crust east and west of the plateau in the latest Cretaceous as the plateau separated from the South Tasman Rise and the Lord Howe Rise, moving east-northeast relative to Australia/Tasmania/STR. Note also the phase of volcanism in the middle to late Eocene that formed the Cascade Seamount and other volcanic features. TWT = two-way traveltime.