precambrian period

English Thesaurus

1. the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago (noun.time)

instance hypernym	:	aeon, eon,
definition	:	the longest division of geological time (noun.time)

part holonym	:	proterozoic, proterozoic aeon, proterozoic eon,
definition	:	from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms (noun.time)

part holonym	:	archaeozoic, archaeozoic aeon, archean, archean aeon, archean eon, archeozoic, archeozoic eon,
definition	:	the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life (noun.time)