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Tertiary period vs Oligocene epoch

Oligocene epoch vs Tertiary period

Tertiary period and Oligocene epoch both are nouns.

Word NounAdjectiveVerbAdverb
Tertiary period Yes No No No
Oligocene epoch Yes No No No
Tertiary period (noun) Oligocene epoch (noun)
the period from 63 million to 2 million years ago from 40 million to 25 million years ago; appearance of sabertoothed cats
Difference between Tertiary period and Oligocene epoch

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