DATE	PERIOD	EVENT	COMMENT
In the beginning ...	---	Genesis 1:1	the universe is born
13 bya	---	the Big Bang	the beginning of the known universe
5 bya	---	formation of the sun	the solar system is born
4.5 bya	Hadean	formation of the Earth/Moon system	the age of the Earth cannot be determined since the surface was molten. Add to the fact that the surface is constantly being renewed via subduction, etc., and the date is impossible to know.
4.0 bya	late Hadean	end of the heavy bombardment	life forms
3.5 bya	Archean	photosynthesis appears	algae form
2.3 bya	Proterozoic	O2 abundance	First Global Winter
0.542 bya	Paleozoic	---	---
0.542 bya	Paleozoic	---	---
0.542 bya	Paleozoic	---	---
2.6 - 0.0117 Ma	Pleistocene	---	---
11.7 - 0 Ka	Holocene	---	---