<Ul> <Li> Hadean Eon--4600--4031 MYA <Ul> <Li> Chaotian Era--4600--4404 MYA--the name alluding both to the mythological Chaos and the chaotic phase of planet formation </Li> <Li> Jack Hillsian or Zirconian Era--4404--4031 MYA--both names allude to the Jack Hills Greenstone Belt which provided the oldest mineral grains on Earth, zircons </Li> </Ul> </Li> <Li> Archean Eon--4031--2420 MYA <Ul> <Li> Paleoarchean Era--4031--3490 MYA <Ul> <Li> Acastan Period--4031--3810 MYA--named after the Acasta Gneiss </Li> <Li> Isuan Period--3810--3490 MYA--named after the Isua Greenstone Belt </Li> </Ul> </Li> <Li> Mesoarchean Era--3490--2780 MYA <Ul> <Li> Vaalbaran Period--3490--3020 MYA--a portmanteau based on the names of the Kapvaal (Southern Africa) and Pilbara (Western Australia) cratons </Li> <Li> Pongolan Period--3020--2780 MYA--named after the Pongola Supergroup </Li> </Ul> </Li> <Li> Neoarchean Era--2780--2420 MYA <Ul> <Li> Methanian Period--2780--2630 MYA--named for the inferred predominance of methanotrophic prokaryotes </Li> <Li> Siderian Period--2630--2420 MYA--named for the voluminous banded iron formations formed within its duration </Li> </Ul> </Li> </Ul> </Li> <Li> Proterozoic Eon--2420--541 MYA <Ul> <Li> Paleoproterozoic Era--2420--1780 MYA <Ul> <Li> Oxygenian Period--2420--2250 MYA--named for displaying the first evidence for a global oxidizing atmosphere </Li> <Li> Jatulian or Eukaryian Period--2250--2060 MYA--names are respectively for the Lomagundi--Jatuli δ C isotopic excursion event spanning its duration, and for the (proposed) first fossil appearance of eukaryotes </Li> <Li> Columbian Period--2060--1780 MYA--named after the supercontinent Columbia </Li> </Ul> </Li> <Li> Mesoproterozoic Era--1780--850 MYA <Ul> <Li> Rodinian Period--1780--850 MYA--named after the supercontinent Rodinia, stable environment </Li> </Ul> </Li> <Li> Neoproterozoic Era--850--541 MYA <Ul> <Li> Cryogenian Period--850--630 MYA--named for the occurrence of several glaciations </Li> <Li> Ediacaran Period--630--541 MYA </Li> </Ul> </Li> </Ul> </Li> </Ul> <Li> Hadean Eon--4600--4031 MYA <Ul> <Li> Chaotian Era--4600--4404 MYA--the name alluding both to the mythological Chaos and the chaotic phase of planet formation </Li> <Li> Jack Hillsian or Zirconian Era--4404--4031 MYA--both names allude to the Jack Hills Greenstone Belt which provided the oldest mineral grains on Earth, zircons </Li> </Ul> </Li> <Ul> <Li> Chaotian Era--4600--4404 MYA--the name alluding both to the mythological Chaos and the chaotic phase of planet formation </Li> <Li> Jack Hillsian or Zirconian Era--4404--4031 MYA--both names allude to the Jack Hills Greenstone Belt which provided the oldest mineral grains on Earth, zircons </Li> </Ul> <Li> Chaotian Era--4600--4404 MYA--the name alluding both to the mythological Chaos and the chaotic phase of planet formation </Li>

How many eras make up earth’s timeline