The island is a shield volcano, although it is not known if it is still active, and it has been categorized as either Holocene or historic, based on date samples ranging from 0.1 to 0.35 million years ago. The summit, Lars Christensen Peak, is a wide circular crater. An ultra prominent peak at elevation, it is named after Lars Christensen. It is not known whether this volcano is extinct or not, because the upper part is apparently unmodified by glaciation, indicating an eruption several centuries ago.