Abstract Neogene volcanic centres are uncommon in the Transantarctic Mountains but at least three basaltic examples occur within 300 km of South Pole, above 2200 m asl and inland margin West Antarctic Rift System. They southernmost volcanoes on Earth have yielded Early—mid Miocene isotopic ages. Two centres, Mt Early Sheridan Bluff, been examined. The centre is unequivocally glaciovolcanic. It ...