Archean

[ɑ:'ki:ən]

解釋/意思:

(noun.) the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life.

(adj.) of or relating to the earliest known rocks formed during the Precambrian Eon .

錄入:库尔特--From WordNet