Proterozoic aeon
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| Noun | 1. |  Proterozoic aeon - from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organismsPrecambrian, Precambrian aeon, Precambrian eon, Precambrian period - the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago |
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