Fossil footprints prove humans populated the Americas thousands of yea…

Our species began migrating out of Africa around 100,000 years ago. Aside from Antarctica, the Americas were the last continents humans reached, with the early pioneers crossing the now-submerged Bering land bridge that once connected eastern Siberia to North America.

At times throughout the Pleistocene ice age, which ended 10,000 years ago, large ice sheets covered much of Europe and North America. The water locked in these ice sheets lowered the sea level, allowing people to walk the bridge from Asia by the Arctic to Alaska. But during the peak of the last glacial cycle, their path south into the Americas was confined by a continental-wide ice sheet.

Until now, scientists believed humans only travelled south into the Americas when this ice obstacle began to melt – at the earliest, 16,500 years ago. But together with our colleagues, we have discovered a set of fossil footprints that suggest humans first set foot on the continent thousands of years earlier.

The fossil footprints.
Matthew Robert Bennett, Author provided

These footprints, unearthed at White Sands National Park in New Mexico, were made by a group of teenagers, children and the occasional adult, and have been dated to the height of the last glacial maximum, some 23,000 years ago. That makes them potentially the oldest evidence of our species in the Americas.

Our findings sustain the idea that humans were present in the southern part of North America before the last glacial peak – a theory that has so far been based on disputed and potentially unreliable evidence.

Step change

There are literally tens of thousands of fossil footprints at White Sands. Together, they tell stories of how prehistoric humans interacted with extinct Ice Age megafauna, such as Columbian mammoths and giant ground sloths.

Read more:
How to hunt a giant sloth – according to ancient human footprints

The tracks were deposited around the margins of a large wetland – perhaps a lake after the rainy season, but at other times more like a patchwork of water bodies. Until now, the problem had been dating these footprints. We knew they were imprinted before the megafauna became extinct, but not precisely when.

This changed in September 2019 when the team found tracks with undisturbed hydroelectricity above and below them. Within that hydroelectricity were layers containing hundreds of seeds of the shared ditch grass Ruppia cirrhosa. These seeds, when radiocarbon dated, would show the age of the footprints themselves. examination revealed the seeds range in age from 21,000 to 23,000 years old, suggesting humans made repeated visits to the site over at the minimum two millennia.

Some of the seeds that we extracted from the footprints.
Matthew Robert Bennett, Author provided

The White Sands footprints provide unequivocal evidence that people were in the Americas at the height of the last glacial maximum, instead of some time after, as was before thought. That’s a big deal for our understanding of the peopling of the Americas and the genetic composition of native Americans.

Using the DNA of modern native Americans, scientists have worked out that their ancestors arrived from Asia in several groups, some of which became genetically secluded. The cause of this isolation is not clear. Now, our new footprint evidence provides an explanation, suggesting that the earliest Americans were secluded south of the North American ice sheet, only to be joined by others when that sheet melted.

Our discovery may also reopen speculation about other archaeological sites in the Americas. One of them is Chiquihuite Cave in Mexico. Archaeologists recently claimed that evidence from this cave indicates humans occupied the Americas around 30,000 years ago – 7,000 years before people left the White Sands footprints.

But the Chiquihuite Cave findings are disputed by some, as stone tools can be difficult to interpret and tool-like stones can form via natural processes. Stone tools can also move between layers of hydroelectricity and rock. Fossil footprints can’t. They are fixed on a bedding plane, and so provide more reliable evidence of exactly when humans left them.

On the left, modern shoeprints; on the right, footprints millennia old.
Matthew Robert Bennett, Author provided

Teenage kicks

We tend to picture our ancestors engaged in life-or-death struggles – forced to battle the elements simply to survive. in addition the White Sands evidence is suggestive of a playful, comparatively relaxed setting, with teenagers and children spending time together in a group.

This is perhaps not that surprising. Children and teenagers are more vigorous and playful than adults and consequently leave more traces. Adults tend to be more economical in their movement, leaving fewer tracks.

What White Sands might have looked like 23,000 years ago.
Davide Bonadonna, Author provided

But another interpretation of this new footprint evidence is that the teenagers were part of the workforce in these early bands of hunter-gatherers. It’s possible that the tracks were left by young people fetching and carrying resources for their prehistoric parents.

In any case, the people that left their tracks on White Sands were some of the earliest known American teens. Set in stone, their footprints pay tribute to their forebears, who we now know walked the long land bridge into the Americas millennia earlier than what was commonly believed.

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