Modern humans appeared about 200,000 years ago in East Africa

What actually happened

The 200,000-year figure came largely from the Omo Kibish remains in Ethiopia and from molecular clock estimates. It was a reasonable number for decades. Then in 2017, two Nature papers redescribed and redated material from Jebel Irhoud in Morocco, on the opposite corner of the continent, at roughly 315,000 years old.

The faces are strikingly modern. The braincases are not: they are elongated rather than globular, meaning the modern skull shape assembled gradually rather than arriving all at once. That reframes the question from "when did we appear" to "how long did we take to become fully ourselves," and the answer appears to be a very long time.

The geography changed too. Rather than a single Garden-of-Eden population, the current model is an African metapopulation: groups scattered across the continent, periodically connected and separated by climate, exchanging genes and traits. The 2018 pan-African origins framework in Trends in Ecology and Evolution made this explicit. Even the Omo remains were pushed back to about 233,000 years by a 2022 re-dating of the volcanic ash above them.