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Precambrian Eon
4.6 - 541 4.059
4.6  Earth formed |
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Precambrian Eon
4.6 - 541 4.059
Hadean Eon
4.6 - 4 .2
Nectarian Luna Period
3.92 - 3.85 .07
3.9  cataclysmic cratering
>22,000 craters diameters >12/20 40 diameters 620/1,000
several diameters 3100/5000 |
3.9 - 2.5 1.4  meteor cluster |
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Precambrian Eon
4.6 - 541 4.059
Archean Eon
4 - 2.5 1.5
| Mesoarchaean Era 3.2 - 2.8 400M |
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cool early Earth theory  modest influx of 
Solar System formation
Earth 
4.5 billion-year-old meteorites found on Earth that contained liquid water alongside a wide diversity of deuterium-poor organic compounds 
water & atmosphere
Late Heavy Bombardment lunar cataclysm 
Earliest Life
Oxygen
Photosynthesis