Figure F2. Regional cross section through time across Site 1171, southwest from the Tasman Sea oceanic crust, across two blocks of the South Tasman Rise, and southwest to the abyssal plain (formerly the Antarctic margin), based on seismic profile Sonne SO36-52 and other geological information. Note the pre-existing Tasman Sea crust and major continental blocks in the latest Cretaceous to Paleocene; the Eocene development of more fault blocks by fast north-south strike-slip motion between Australia and Antarctica, the departure of Antarctica by north-south spreading, and the emplacement of oceanic crust; and the Oligocene collapse of the southwestern margin. BFZ = Balleny Fracture Zone.