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Oligocene

Ol·i·go·cene

Oligocene

 
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.
 
part of speech: noun
definition: the Oligocene Epoch, or the rock formations that date from that time.