Frontispiece 1. Hole 1118A core photograph of the rift onset unconformity. These cores illustrate the transition facies from dolerite interpreted from Formation MicroScanner images as a clast in conglomerate (interval 180-1118A-70R-1, 87–140 cm), overlain by shallow-marine conglomerates (interval 180-1118A-69R-1, 15 cm, through 70R-1, 87 cm), limestone (68R-3, 115 cm, through 69R-1, 15 cm), and volcaniclastic sandstone (68R-1, 0 cm, through 68R-3, 115 cm). We interpret the contact at the top of the dolerite as the rift onset unconformity.

Frontispiece 2. Migrated multichannel seismic lines showing the location of Sites drilled during Leg 180 into the footwall (Moresby Seamount Sites 1114 and 1116), hanging wall (rift basin Sites 1108 and 1110–1113) and down-flexed northern margin (Sites 1109, 1115, and 1118) of the western Woodlark Basin. Common depth points (CDPs) are labeled, and the top two sections overlap by 100 CDPs (1.25 km).