On: Fresh water on Earth emerged 500M years earlier th...

[Symmetry]

If there's a subsequent population replacement the estimate will thrown completely off.

Edit: And to be clear, not all population replacement is violent. The Norse in Greeneland were gone when the Inuit showed up for instance.

[borisk → Symmetry]

Did some of the last Norse join the Inuit?

[medstrom → borisk]

Could be. Little is known: https://en.wikipedia.org/wiki/Norse_settlements_in_Greenland...