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ORIGIN OF EARTH -
BIG-BANG HYPOTHESIS -
Chronology of events
Origin
Ago (Billion yrs)
Universe
10-20
Solar system
4.6
Earth
4.5
Oldest surviving rock
4.3
Life (Heterotrophs)
4.2-3.9
Old rock
3.9
Chemosynthetic
procaryotes
3.8-3.5
Oldest microfossils
(Cyanobacteria)
3.3-3.5
Photosynthetic procaryotes
3.5-3.3
Eukaryotes
1.6-1.5
NEBULAR HYPOTHESIS -
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