538 million years ago · approximate date
The Cambrian explosion
Most major animal groups appear within a few tens of millions of years.
Near the base of the Cambrian, the oceans filled with animals carrying shells, eyes and limbs. Most of the major branches of the animal kingdom trace back to this stretch of time.
- Period
- Cambrian
- Earth's history already passed
- 88.1498 percent
- 4.54 kilometres
- 538 metres from the end
- One day
- 21:09:21
- One year
- November 18, 17:55