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Eocene

E·o·cene

Eocene

 
pronunciation:
i sin
parts of speech:
adjective, noun
part of speech: adjective
definition: of, relating to, or designating the geological epoch between the Paleocene and Oligocene of the Tertiary Period, from approximately 54 million to 38 million years ago, when modern mammals became dominant.
 
part of speech: noun
definition: the Eocene Epoch, or the rock formations that date from that time.