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Ol·i·go·cene
 Oligocene
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- pronunciation:
- a
l
go
sin
- parts of speech:
- adjective, noun
| part of speech: |
adjective |
| definition: |
of, relating to, or designating the geological epoch between the Eocene and Miocene of the Tertiary Period, from approximately 38 million to 26 million years ago, when mastodons and apes appeared.
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| part of speech: |
noun |
| definition: |
the Oligocene Epoch, or the rock formations that date from that time.
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