Footprints in Mexico Older than Thought

The Berkeley Geochronology Center has completed its dating of the footprints found in volcanic ash at the Cerro Toluquilla site in Puebla, Mexico, and comes up with a date more than 1,000,000 years old. These had been reported earlier this year to date around 40,000 years ago, which would have been odd enough. This enormously early date means that the footprints are from a non-hominid primates, or evidence that hominids were in North America a shockingly long time ago. Article in Nature this week; this story is from Eureka Alert.