It was okay for a set of footprints to prove that mankind arrived in the Americas 40,000 years ago instead of just 10,000. But now that argon dating reveals the rocks are 1.3 million years old, orthodox scientists have determined that they aren't human footprints after all (because they couldn't be, could they?).

The article does not offer up any alternative ownwer of the footprints.

Source: New Scientist