 Nemo I formed 40,000 - 45,000 years ago and Nemo III 25,000 - 24,500 or 26,000 years ago; a radiocarbon date of 24,500 ± 740 years ago has been obtained on it.Nemo Peak proper formed about 9,050 ± 100 or 9,130 ± 140 radiocarbon years ago.Holocene volcanic activity includes the emission of tephra and lava flows with eruptions every 1,400 - 1,200 years since 3,800 years before present.