When British and Australian researchers announced earlier this year that they’d found human footprints in 40,000-year-old rock near Puebla, Mexico, many anthropologists withheld judgment. And rightfully so. Using both argon/argon and paleomagnetic dating, UC Berkeley geologists have obtained a better date for the volcanic tuff: 1.3 million years. Either the footprints are extremely old, dating from a time before Homo sapiens arose, or they are not footprints at all.
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