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nounfrom 40 million to 25 million years ago; appearance of sabertoothed cats
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Definition that contains oligocene
- hamamelidanthum genus of fossil plants of the Oligocene having flowers resembling those of the witch hazel; found in Baltic region
- mesohippus North American three-toed Oligocene animal; probably not directly ancestral to modern horses
- saber-toothed tiger any of many extinct cats of the Old and New Worlds having long swordlike upper canine teeth; from the Oligocene through the Pleistocene
- genus hamamelidanthum genus of fossil plants of the Oligocene having flowers resembling those of the witch hazel; found in Baltic region
- sabertooth any of many extinct cats of the Old and New Worlds having long swordlike upper canine teeth; from the Oligocene through the Pleistocene