How Old Are the White Sands Footprints, and Do They Rewrite the Peopling of the Americas?

Background

In 2009, National Park Service staff and researchers began noticing human footprints eroding out of gypsum lakebed sediments at White Sands National Park in the Tularosa Basin of south-central New Mexico. The site turned out to hold the largest known collection of Pleistocene, or Ice Age, fossil footprints in the world: thousands of human and megafauna tracks, including mammoths, giant ground sloths, dire wolves, and camels, preserved along the shoreline of a vanished Ice Age lake called Lake Otero. One trackway, made by a person walking back and forth, extends for more than 1.5 kilometres. Demographic analysis of the human prints suggests many were made by teenagers and children, alongside adults, plausibly on errands or in the course of daily foraging.

The dating claim that made White Sands internationally significant came in September 2021, when Matthew Bennett of Bournemouth University and colleagues published radiocarbon dates in Science placing a sequence of footprints between roughly 23,000 and 21,000 years ago, squarely within the Last Glacial Maximum, the coldest, most ice-bound phase of the last Ice Age. For decades, the dominant "Clovis first" model held that humans did not reach the Americas south of the continental ice sheets until roughly 13,000 years ago, after an interior ice-free corridor opened between the retreating Laurentide and Cordilleran ice sheets. A confirmed 21,000-to-23,000-year-old human presence would place people in New Mexico thousands of years before that corridor is thought to have existed at all, implying an entirely different migration route, very likely along the Pacific coast.

Evidence For and Against

The 2021 dates rested on seeds of Ruppia cirrhosa, an aquatic ditch-grass, found in the same stratigraphic layers as the footprints and, in several cases, embedded within individual prints. This immediately drew a methodological objection: aquatic plants can absorb old, geologically stored carbon dissolved in groundwater, a phenomenon called the "hard-water" or reservoir effect, which makes a sample radiocarbon-date older than the year it actually grew. Researchers Dave Rachal and Robert Dello-Russo argued in a peer-reviewed critique that this effect likely inflated the Ruppia dates and that the claimed Last Glacial Maximum age for the site was not yet supportable.

The original research team, led by Jeffrey Pigati and Kathleen Springer of the US Geological Survey together with Bennett's group, answered the critique with independent evidence that did not rely on Ruppia at all. In a 2023 Science paper, they radiocarbon-dated conifer pollen collected from the same layers; unlike an aquatic plant, pollen from land plants fixes atmospheric carbon directly and is not subject to the reservoir effect. The pollen dates, a calibrated range of roughly 23,400 to 22,600 years ago, were statistically indistinguishable from the original Ruppia dates. The team added a third, chemically unrelated method, optically stimulated luminescence dating of the quartz grains in the footprint-bearing sediment itself, which measures time elapsed since the grains were last exposed to sunlight rather than any carbon at all, and it agreed with both prior methods.

In June 2025, a team led by University of Arizona geoarchaeologist Vance Holliday published a fourth line of evidence in Science Advances: radiocarbon dating of the paleolake mud layers that physically bracket the footprint horizons, sampled during 2022 and 2023 fieldwork and processed by two separate laboratories. Combined with the earlier work, the site now has 55 consistent radiocarbon and luminescence dates spanning three distinct material types, seeds, pollen, and mud, dated by unrelated physical mechanisms and different labs, all converging on the same roughly 23,000-to-21,000-year window.

What the site still lacks is any of the archaeological material usually expected alongside a human occupation this significant: no stone tools, no hearths, no campsite features, and no human skeletal remains have been found in direct association with the footprints. Critics note this absence means the tracks alone cannot establish who these people were, where they came from, or how long they stayed; they record that people walked across the lakeshore at this date, not a settlement.

Common Misconceptions

The finding is sometimes reported as proof of the "first Americans," a framing archaeologists and Indigenous scholars caution against. White Sands demonstrates a confirmed human presence at a specific place and time; it does not establish an upper limit on how much earlier people may have arrived elsewhere in the Americas, nor does it settle the migration-route question beyond ruling out the ice-free corridor as it stood 21,000-23,000 years ago. Some Indigenous scholars, including Cree-Métis archaeologist Paulette Steeves, have also pointed out that a long history of archaeology dismissing claims of deeper Indigenous presence in the Americas means a single confirmed date, however well supported, should not be mistaken for the whole picture.

The footprints have also been folded into claims well beyond what the dating itself supports. Ancient Apocalypse: The Americas, the second season of Graham Hancock's Netflix documentary series, released in October 2024, presents White Sands as evidence for Hancock's argument that an advanced, technologically sophisticated civilisation occupied the Americas long before mainstream archaeology's accepted timeline, the same lost-civilisation framing applied to Gunung Padang's disputed dating claim. The footprint researchers make no such claim, and nothing about the find, foraging tracks with no accompanying tools, structures, or artefacts, points to technological sophistication of any kind. An earlier-than-expected human presence and an advanced lost civilisation are entirely different claims, and only the first has evidence behind it.

Current Consensus

Among archaeologists and Quaternary scientists, much as with the Homo naledi burial claims, a dramatic human-origins claim earned acceptance by surviving repeated independent scrutiny rather than by a single announcement, the 23,000-to-21,000-year age for the White Sands trackways is now widely accepted; the convergence of three chemically independent dating methods, applied by different research teams and laboratories to different materials, is considered strong confirmation, and it directly addressed the one substantive technical objection raised against the original study. What remains open is not the age of this particular site but its implications: how humans reached the Tularosa Basin during the Last Glacial Maximum, what route they travelled, and how this population relates to the ancestors of later, better-documented Clovis-era peoples. Those questions depend on evidence from other sites that has not yet been found, and the scientific debate has moved on from "are these dates real" to "what does an occupation this early actually mean."

Why This Discovery Still Matters

White Sands endures as a talking point because it did something rare in archaeology: it forced a genuinely well-supported revision to a decades-old consensus, the "Clovis first" model, using methods precise enough to withstand a serious challenge and be tested again. That combination, an overturned textbook date and a satisfying methodological story of challenge and confirmation, travels well outside academic circles. It also arrived at a moment when audiences were primed for stories about hidden, older human history, which is exactly the gap Ancient Apocalypse stepped into, borrowing the site's real scientific credibility for a claim, an advanced lost civilisation, that the footprints themselves say nothing about. The site's continuing appeal lies in that tension: a discovery whose actual, well-evidenced claim, people walking across a Pleistocene lakeshore, is already remarkable enough, and a much larger claim built on top of it that isn't, a contrast Atlantis's own unverified literary origins make in the opposite direction: a site with essentially no physical evidence, set against one with an unusually strong claim to it.