<Li> Accretion and differentiation: a period of planetary formation until giant Moon - forming impact event . </Li> <Li> Hadean: dominated by heavy bombardment from about 4.51 Ga (possibly including a Cool Early Earth period) to the end of the Late Heavy Bombardment period . </Li> <Li> Archean: a period defined by the first crustal formations (the Isua greenstone belt) until the deposition of banded iron formations due to increasing atmospheric oxygen content . </Li> <Li> Transition: a period of continued iron banded formation until the first continental red beds . </Li>

What kinds of life forms were dominant during the precambrian era