WASHINGTON - Our species arose in Africa more than 300,000 years ago, with the oldest-known Homo sapiens fossils discovered at a site in Morocco called Jebel Irhoud, located between Marrakech and the Atlantic coast. But the scarcity of Homo sapiens fossils from early in our evolutionary history and the geographical spread of those remains in Africa in places like Ethiopia...
A composite reconstruction of the earliest known Homo sapiens fossils from Jebel Irhoud in Morocco, based on micro computed tomographic scans of multiple original fossils, is shown in this undated handout photo obtained by Reuters, on June 7, 2017.WASHINGTON - Our species arose in Africa more than 300,000 years ago, with the oldest-known Homo sapiens fossils discovered at a site in Morocco called Jebel Irhoud, located between Marrakech and the Atlantic coast.
The research indicated that multiple ancestral groups from across Africa contributed to the emergence of Homo sapiens in a patchwork manner, migrating from one region to another and mixing with one another over hundreds of thousands of years. It also found that everyone alive today can trace their ancestry to at least two distinct populations that were present in Africa dating back about a million years.
"All humans share relatively recent common ancestry, but the story in the deeper past is more complicated than our species evolving in just a single location or in isolation," said University of Wisconsin-Madison population geneticist Aaron Ragsdale, lead author of the study published this week in the journalThe ancestral groups were likely spread across a geographic landscape in a population structure that, Ragsdale said, "was 'weak,' meaning that there was ongoing or at...
The fossil record is scanty in the time period that would be most informative about the emergence and spread of Homo sapiens, and there is no ancient DNA from skeletal or dental remains from these time periods, the researchers said.
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