Individual #Eocene_epoch__Eocene  from 40 million to 58 million years ago; presence of modern mammals
  instance of:  epoch
  part of:  Tertiary_period__Tertiary  from 2 million to 63 million years ago
     part of:  Cenozoic_era__Cenozoic__Age_of_Mammals  approximately the last 63 million years

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