Extrapolating based on the depth of the deposits between, the authors estimate that the tools are roughly between 1.72 and 1.81 million years old. That lets them start zeroing in on a more precise date based on reversals in the Earth’s magnetic field. This provides a firmer estimate: 1.76 million years, 350,000 years older than the previous site that had been dated so precisely. It also lines up with one of the earliest Homo erectus fossils, reinforcing the link between the two.
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