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Meaning : The time from 3,800 million years to 2,500 million years ago. Earth's crust formed. Unicellular organisms are earliest forms of life.
Synonyms : archaeozoic, archaeozoic aeon, archean aeon, archean eon, archeozoic, archeozoic eon
Meaning : Of or relating to the earliest known rocks formed during the Precambrian Eon.
Synonyms : archaean
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