3.7 billion years ago · approximate date
The first life
The earliest traces of living cells appear in ancient rock.
Rocks of about this age carry chemical and structural marks that many researchers read as traces of life, though the oldest of those claims are disputed. Firmer evidence appears by about 3.5 billion years ago. Either way the organisms were single celled and microscopic.
- Period
- Archean
- Earth's history already passed
- 18.5022 percent
- 4.54 kilometres
- 3.7 kilometres from the end
- One day
- 04:26:25
- One year
- March 9, 12:47
Source: Smithsonian Institution · Source to be verified