 It is studied to understand seafloor spreading and transform faults, and hydrothermal alteration of the undersea floor.Most of the south of the island consists of sub oceanic basalt layered between Globigerina ooze.The part north of Langdon Point and Ballast Bay consists of serpentinite derived from gabbro, troctolite, and peridotite (dunite, wehrlite, and harzburgite).