New K·Ar age determinations on basaltic volcanic sequences in the Chatham Islands, 900 km east of South Island, New Zealand, combined with additional field and paleontologic studies, have led to a stratigraphic revision and the recognition of three distinct volcanic episodes-Late Cretaceous (70-85 m.y.), Eocene-early Oligocene (35-53 m.y.), and late Miocene-Pliocene (2-6 m.y.). Paleontology, palynology, and
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