Fourteen thousand years ago, along a quiet creek in what is now central Alaska, a small group of Ice Age hunters stopped to work stone, tend fires, and process mammoth ivory.
They could not have known it at the time, but the choices they made—where to camp, which materials to use, and how to survive in a rapidly changing Arctic landscape—may help explain one of the biggest mysteries in human history: how the first people entered North America.
According to a new peer-reviewed study published in Quaternary International, the Holzman archaeological site in Alaska’s middle Tanana Valley preserves some of the earliest and clearest evidence yet of human activity in the Americas.
The findings suggest that this region was not just briefly visited by wandering hunters but instead served as a crucial staging ground for the migration of ancestral Native Americans south of the continental ice sheets and into the rest of the continent.
“Based on current evidence, the confluence of Shaw Creek with the Tanana River was especially active during the initial arrival of Indigenous people,” researchers write. “The evidence suggests a late southern migration by ancestral Clovis people south of the continental ice sheets into the mid-continental North America sometime between 14-13 ka.”
Holzman site at the crossroads of Ice Age migration
The study, conducted by anthropologists and researchers from Adelphi University and the University of Alaska Fairbanks, focuses on decades of excavation and analysis at the Holzman site, located along Shaw Creek, a tributary of the Tanana River. This area sits at a geographic crossroads between the vast landmass that once connected Siberia and Alaska, known as Beringia, and the interior routes that later opened through the retreating North American ice sheets.
For years, archaeologists have debated whether the first Americans arrived via a coastal route along the Pacific Coast or through an interior passage known as the Ice-Free Corridor.
This new research does not claim to settle the long-running debate over exactly how and when the first people reached the New World, but it strengthens the case that central Alaska played a critical role in the final stages before people spread rapidly south.
For decades, the so-called “Clovis First” hypothesis held that the earliest Americans crossed a Beringian land bridge and moved through an ice-free corridor into the continent around 13,000 years ago.
That model has been largely abandoned as a growing body of pre-Clovis evidence has emerged, like fossilized human footprints at White Sands National Park, New Mexico, and sites like Monte Verde in Chile, which suggest human presence well before the Clovis era.
Adding to the dissension, as recently reported by The Debrief, artifacts unearthed at Topper Site in Allendale County, South Carolina, could date back as far as 50,000 years. If confirmed, this would push human arrival in the Americas back tens of thousands of years beyond even the accepted pre-Clovis dates and force a major rethink of early migration theories.
And while such extreme early dates remain fiercely debated among archaeologists, they underscore how unsettled and dynamic the field has become.
At Holzman, researchers identified multiple layers of human occupation dating between roughly 14,300 and 13,000 years ago. These dates place the site among the oldest securely dated archaeological locations in the Americas, reinforcing the idea that people were living, working, and adapting in interior Alaska long before the widespread Clovis-age manifestations appear further south.
Significantly, the site is remarkably well preserved, allowing scientists to reconstruct how people lived, worked, and moved across the landscape during the closing millennia of the Ice Age.
Stone tools and survival on the Mammoth steppe
Excavations at Holzman revealed hearths used for cooking, stone tools made from locally available quartz and higher-quality materials carried in from elsewhere, and extensive evidence of mammoth ivory processing.
In the oldest occupation layer, known as Component 5b, researchers uncovered a nearly complete female woolly mammoth tusk cached alongside stone flakes, charcoal from a small fire, and fragments of red ochre.
Radiocarbon dates show that the tusk and the human activity occurred at essentially the same time, demonstrating a direct overlap between people and mammoths in the Tanana Valley.
A slightly younger layer, Component 5a, revealed an apparent ivory workshop. Here, ancient toolmakers used heavy quartz choppers and anvils to break mammoth tusks into manageable pieces, shaping them into blanks or finished tools.
Among the discoveries were mammoth ivory rods—slender, carefully shaped implements that represent the earliest known examples of this technology in the Americas.
“Evidence for cooking and ivory tool manufacture dated to 14,000 years ago… has been demonstrated—making Holzman among the earliest sites in the Americas,” researchers write.
These ivory tools are especially significant because similar artifacts appear later at Clovis sites across the continental United States. Their presence in Alaska hundreds of years earlier suggests a technological and cultural link between the First Alaskans and the people who would eventually spread across much of North America.
Holzman site Was More than a stopover
The findings challenge the idea that early Alaskans were merely passing through during a rapid southward migration. Instead, the archaeological record at Holzman paints a picture of repeated visits, specialized activity areas, and deep knowledge of local resources.
Researchers argue that the Tanana Valley offered a unique ecological niche during the Late Pleistocene and final stage of the Ice Age. Unlike nearby glacial rivers choked with silt, Shaw Creek provided clear freshwater that attracted both animals and people. The surrounding landscape preserved abundant mammoth steppe habitat at a time when such environments were disappearing elsewhere.
Stone tool analysis shows that early inhabitants initially relied on high-quality chert and basalt carried from distant sources, then increasingly turned to local quartz as they learned the landscape. Researchers say this pattern is a hallmark of groups settling into a new region rather than merely passing through.
Over time, these people developed efficient strategies for exploiting mammoth ivory, birds, fish, and other resources. The presence of hearths associated with waterfowl remains hints at seasonal hunting and a diverse diet, while the careful organization of tool-making debris shows that activities were planned and repeated.
Implications for the First Human Arrivals to the Americas
Taken together, the findings support a growing view among archaeologists and anthropologists that ancestral Native Americans spent generations in eastern Beringia before moving south. Genetic studies have proposed a “Beringian standstill,” during which populations became isolated from their Asian ancestors before dispersing into the Americas. The Holzman site provides a rare archaeological context for what that standstill may have looked like on the ground.
The study also suggests that the final push southward may have been closely tied to megafauna hunting, particularly mammoths. As Ice Age climates warmed and mammoth populations declined, highly mobile hunters may have followed these animals along newly opening corridors, carrying with them the tools, technologies, and knowledge developed in places like the Tanana Valley.
“The confluence of Shaw Creek with the Tanana River was especially active during the initial arrival of Indigenous people,” the authors note, emphasizing the area’s role as an early hub of human activity.
While the debates about pre-Clovis sites and migration routes are far from over, the findings at Holzman add weight to the theory that central Alaska was not a peripheral backwater in the story of human arrival in the Americas. Rather, it was a proving ground, where Ice Age people adapted Old World survival strategies to a New World landscape and laid the groundwork for one of humanity’s most remarkable migrations.
As new excavations and advancing technologies continue to refine the timeline, sites like Holzman are helping archaeologists move beyond abstract models toward a clearer understanding of one of humanity’s most enduring historical mysteries.
“The Tanana Valley served as a focus for highly mobile megafauna hunters as they explored and settled into new areas of the mammoth steppe,” researchers conclude. “ It was their ancestors that eventually dispersed south of the continental ice sheets in the broader context of the peopling of the Americas.”
Tim McMillan is a retired law enforcement executive, investigative reporter and co-founder of The Debrief. His writing typically focuses on defense, national security, the Intelligence Community and topics related to psychology. You can follow Tim on Twitter: @LtTimMcMillan. Tim can be reached by email: tim@thedebrief.org or through encrypted email: LtTimMcMillan@protonmail.com