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| physical phenomena > event > era > geological era > cenozoic era > tertiary period > oligocene epoch |
| oligocene epoch | ||||
| subject | fact | |||
| oligocene epoch | has duration 11 million years | ![]() |
| has start time 36 million years ago | ![]() | |
| is a kind of tertiary period | ![]() | |
| event | has synonym world point | ![]() |
| has time of occurrence | ![]() |