Archaean

See also: archaean and Archæan

English

Alternative forms

Etymology

From Ancient Greek ἀρχαῖα (arkhaîa, “ancient”), neuter plural of ἀρχαῖος (arkhaîos, “ancient”).

Adjective

Archaean (not comparable)

  1. (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.

Translations

Proper noun

Archaean

  1. (geology) The eon from 2,500 Ma to 4,000 Ma.

Hypernyms

Hyponyms
  • (eon 2,500-4,000 Ma): Eoarchaean, Paleoarchaean, Mesoarchaean, Neoarchaean

Coordinate terms

Translations

See also
  • Appendix:Geologic timescale

Further reading
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