The revised estimate, based on nearby volcanic ash, fits in nicely with most models of modern human evolution.
The Omo I skeleton was found in 1967 at the Omo Kibish Formation of southwestern Ethiopia. The site is positioned within the East African Rift valley,
. “Each eruption has a unique chemical signature. Using these fingerprints, we could track the far-traveled fine ash hundreds of miles away from the volcanoes. In Ethiopia, these ash layers can be found at archaeological sites where tools and fossils of our ancestors were identified.”
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