Oligocene
The Oligocene epoch (39 to 22 million years ago) is the transition period between the earlier and later Tertiary period (65 to 2 million years ago).
A key feature of evolution is the ripple ...
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Oligocene Epoch
In geologic time, the Oligocene Epoch occurs during the Tertiary Period (also sometimes divided or referred to in terms of a Paleogene Period and a Neogene Period) of the Cenozoic Era ...
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Oligocene
Oligocene Epoch