Figure F7. Close-up photograph of the striking lithologic contact between Units II and III at 272.8 mbsf (interval 189-1171D-3R-3, 18-32 cm). This corresponds to the Eocene-Oligocene transition and marks a significant change in the depositional environment, from pelagic carbonate-dominated deposition during the Oligocene to the predominantly siliciclastic deposition during the late Eocene.