Volcanic ash left over from a huge ancient eruption has helped scientists determine that important early Homo sapiens fossils found in Ethiopia in 1967 are older than previously believed, providing fresh insight into the dawn of our species.
showed that bones and teeth discovered at a site called Jebel Irhoud in Morocco were more than 300,000 years old, representing the earliest fossils attributed to Homo sapiens. Some scientists have questioned whether those fossils genuinely belong to our species.
"Omo I is the oldest Homo sapiens with unequivocal modern human traits," University of Cambridge volcanologist and study co-author Clive Oppenheimer added. The researchers determined the ash's geochemical composition and compared that with other volcanic remnants in the region. They found it matched a light and porous volcanic rock called pumice created during the eruption of Shala volcano about 230 miles away. They then were able to date the pumice to determine when the eruption happened.
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