Figure F16. Hole 1118A core photograph illustrating the transition facies from dolerite (interval 180-1118A-70R-1, 87-140 cm), interpreted as a clast in conglomerate, 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.