Noun geological era has 1 sense
  1. era, geological era - a major division of geological time; an era is usually divided into two or more periods
    --1 is a kind of geological time, geologic time
    --1 is a part of eon, aeon
    --1 has parts: period, geological period
    --1 has particulars:
     Cenozoic, Cenozoic era, Age of Mammals; Mesozoic, Mesozoic era, Age of Reptiles; Paleozoic, Paleozoic era
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