geological era

Definitions of geological era
  1. noun
    a major division of geological time; an era is usually divided into two or more periods
    synonyms: era
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    Age of Mammals
    approximately the last 63 million years
    Age of Reptiles
    from 230 million to 63 million years ago
    Paleozoic era
    from 544 million to about 230 million years ago
    type of:
    geologic time, geological time
    the time of the physical formation and development of the earth (especially prior to human history)
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