The Omo I fossils are a set of Homo sapiens bones unearthed in the late 1960s, deep in Ethiopia's Omo Kibish formation. The site lies within the Ethiopian Rift, a valley where volcanic activity has preserved a wealth of human fossils and artefacts. For decades, scientists believed the Omo I bones were less than 200,000 years old.
in the journal Nature this week, is part of a larger effort to date major volcanic eruptions throughout the Ethiopian Rift's history. Dating those eruptions would allow researchers to more accurately date the fossils there, and help them piece together a timeline of human history — which seems to stretch further into the past than they realised.
"It's possible that new finds and new studies may extend the age of our species even further back in time," Christine Lane, a coauthor of the study who leads the Cambridge Tephra Laboratory, said in aTo determine the age of other fossils from the Omo Kibish formation, scientists have radiometrically dated the layers of volcanic ash above and below the fossil.
"Each eruption has its own fingerprint — its own evolutionary story below the surface, which is determined by the pathway the magma followed," Vidal said in the press release."Once you've crushed the rock, you free the minerals within, and then you can date them, and identify the chemical signature of the volcanic glass that holds the minerals together."
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