Phanerozoic aeon

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Noun1.Phanerozoic aeon - the period from about 5,400 million years ago until the present
Age of Mammals, Cenozoic, Cenozoic era - approximately the last 63 million years
References in periodicals archive ?
Until recently, everybody agreed that we live in the Holocene epoch of the Quaternary period, which in turn is part of the 65-million-year old Cenozoic era, the most recent phase of the 540-million-year Phanerozoic aeon.