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physical phenomena > event > era > geological era > cenozoic era > tertiary period > oligocene epoch
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oligocene epoch comparison table
Subject has duration is a kind of has start time
tertiary period63 million yearscenozoic era63 million years ago
oligocene epoch11 million yearstertiary period36 million years ago

Next tertiary periodpaleocene epoch    Uptertiary period    Previous tertiary periodmiocene epoch