proterozoic eon

English Thesaurus

1. from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms (noun.time)

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

part meronym	:	precambrian, precambrian aeon, precambrian eon, precambrian period,
definition	:	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)

derivation	:	proterozoic,
definition	:	formed in the later of two divisions of the Precambrian era (adj.all)

derivation	:	proterozoic,
definition	:	formed in the later of two divisions of the Precambrian era (adj.all)