Life forms that lived 542 million years ago and later... Proterozoic - Neoproterozoic (https://en.wikipedia.org/wiki/Neoproterozoic) - Mesoproterozoic (https://en.wikipedia.org/wiki/Mesoproterozoic) - Paleoproterozoic (https://en.wikipedia.org/wiki/Paleoproterozoic) Archean Eon - Archean (https://en.wikipedia.org/wiki/Archean) Hadean Eon - Hadean (https://en.wikipedia.org/wiki/Hadean)