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middle Eocene Epoch
geochronology
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Eocene Epoch
- In Eocene Epoch
8 million years ago), Middle (47.8 million to 38 million years ago), and Late (38 million to 33.9 million years ago) epochs. The name Eocene is derived from the Greek eos, for “dawn,” referring to the appearance and diversification of many modern groups of organisms, especially mammals and mollusks.
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