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Complete Definition of "Archaean"

English
Adjective
en-adj
#geology of, or relating to the geologic eon from about 3,800 to 2,500 million years ago; comprises the Eoarchean, Paleoarchean, Mesoarchean and Neoarchean eras; marked by an atmosphere with little oxygen, the formation of the first continents and oceans and the emergence of simple life
Noun
Archaean
#geology the Archaean eon
See also
Wiktionary appendix:Geologic timescale

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