A groundbreaking study led by the University of Arizona has confirmed that humans inhabited the Americas as early as 23,000 years ago—upending long-held theories about migration timelines. Published in Science Advances, the research supports earlier findings from fossilized footprints at New Mexico’s White Sands National Park, using radiocarbon dating of ancient mud to reinforce the controversial 2021 discovery.
The study, co-authored by archaeologist Vance Holliday, analyzed layers of sediment surrounding 23,000-year-old human footprints excavated at White Sands. These prints, first dated in 2021 using ancient seeds and pollen, faced skepticism over the reliability of plant-based dating methods. The new research addresses those doubts by examining mud deposits in the same area, yielding matching age estimates (20,700–22,400 years old) through an independent lab.
Holliday, a professor emeritus with decades of expertise in early American cultures, emphasized the consistency of the data: “It would be serendipity in the extreme for all these dates to align if they were wrong.” The footprints, preserved in clay beneath gypsum dunes, were left by hunter-gatherers near an ancient lakebed—a landscape now eroded or buried under vast sand deposits.
Despite the robust evidence, critics question why no artifacts or settlements accompany the footprints. Holliday suggests that transient groups may have carried tools with them, leaving minimal traces. “Hunter-gatherers wouldn’t casually discard resources in such a resource-scarce environment,” he explained.
- “You realize [the footprints] contradict everything you’ve been taught about the peopling of North America,” said Jason Windingstad, a co-author and doctoral candidate.
- “We have direct data—and a lot of it now,” Holliday added, underscoring the study’s rigor.
The findings challenge the “Clovis First” theory, which placed human arrival in the Americas around 13,000 years ago. With three independent dating methods corroborating the timeline, the study marks a pivotal shift in understanding early human migration. Future research aims to explore broader regions for additional evidence of these ancient populations.
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