noun
a geological epoch that lasted from about 56 to 34 million years ago, characterized by the appearance of modern flora and fauna
article
a word that specifies a noun as definite or indefinite
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The Eocene epoch is a geological period that lasted from about 56 to 33.9 million years ago.
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Hey, did you know that the Eocene era was a really long time ago?
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Back in the Eocene, things were totally different, man.
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Exploring the Eocene period is like taking a trip back in time to a whole different world.