Prehistory of Alaska

The prehistory of Alaska covers the long period before written records, beginning when the first people entered the region from Siberia across Beringia during the last Ice Age. Archaeological sites in the Tanana Valley, such as Swan Point and Upward Sun River, show that people were living in Interior Alaska more than 14,000 years ago, making Alaska central to the question of how the Americas were first settled. Over thousands of years, those early groups gave rise to the Indigenous peoples of Alaska [1][2][3].

Beringia and the First Arrivals

During the last Ice Age, so much water was locked in glaciers that sea level dropped and a broad land known as Beringia connected Siberia to Alaska. Paleolithic people crossed into northwestern North America at some point between 40,000 and 15,000 years ago, and the most likely date is less than 20,000 years ago [1]. Archaeologists debate the routes they took. One possibility is an ice-free corridor through northwestern Canada that opened when the Wisconsin glaciation temporarily receded, and another is travel by sea along the southeastern coast about 17,000 years ago [1].

Swan Point

Swan Point, a hill in the Tanana River valley just north of Delta Junction, was found in 1993 by archaeologist Charles Holmes while working for the Alaska Department of Natural Resources. University of Alaska researchers describe it as more than 14,000 years old, the oldest well-documented evidence of human presence in Alaska, and older than the Clovis culture of the contiguous United States [3]. Radiocarbon dating of mammoth ivory and teeth showed that people and mammoths coexisted and that the site acted somewhat like an ivory workshop, where tusks were broken and shaped into tools [3].

Microblades and Stone Tools

Microblades, small blades about an inch long made of chert, obsidian or basalt, were set into projectile points and used on atlatl-thrown darts. They match the technology used by the Dyuktai people of Siberia at about the same time, suggesting a link between Siberia and Alaska [3]. Excavations at nearby Broken Mammoth and Swan Point also indicate that microblades were part of the earliest stone tool assemblages in the region, which argues for an origin in western Beringia [2].

Broken Mammoth and the Tanana Valley

The Broken Mammoth site lies in the Shaw Creek region of the middle Tanana Valley and is one of several important sites with Mead and Swan Point. Occupations there date to about 11,500 and 10,400 years ago, and butchered bird and mammal remains were preserved in wind-blown loess alongside stone tools and hearth charcoal [2]. Archaeologists use terms such as the Chindadn, Nenana and Denali complexes to describe early tool traditions, and the relationships among them are still debated [2].

Upward Sun River and the Ancient Beringians

At the Upward Sun River site in central Alaska, researchers found the remains of two infants who lived about 11,500 years ago. In a study published in the journal Nature, geneticists extracted DNA from one infant and found that the ancestors of the group lived in East Asia about 35,000 years ago and became genetically isolated from other Asians [4]. The founding population then split into two. One group, called the Ancient Beringians, stayed in and around Beringia, and the infants are the first hard evidence of them. The other moved south and is believed to be the direct ancestor of present-day Native Americans [4]. How the Ancient Beringians ended is still unknown.

Regional Peoples Emerge

Over millennia, distinct cultures developed in the different environments of Alaska. The Aleut settled the Aleutian Islands about 10,000 years ago and became known for skin kayaks and finely made basketry. The Iñupiat lived across the Arctic and the Yup’ik in the west, and both used umiaks and kayaks for sea mammal hunting and were known for ivory carving. In the Interior, Athabascans lived in small, mobile bands as hunters and fishers, while on the southeastern coast the Tlingit, Haida and Tsimshian built societies organized around wealth, clans and potlatches [1].

Trade and Contact

Trade networks with Asia and with groups to the south were active before European contact [1]. Goods such as obsidian, ivory and furs moved across long distances, linking communities across the North.

Why It Matters

Alaska’s archaeological record is central to understanding the settlement of the Americas. Discoveries in the Tanana Valley help test ideas about when people arrived, what technology they carried and how they were related to the peoples of Siberia and the Americas [2][3][4]. Today, researchers work with Alaska Native communities to study and protect these sites.

Interpreting the Evidence

Dating early sites is difficult because Arctic and subarctic soils preserve organic material unevenly, and wind-blown loess can bury and mix deposits. Researchers therefore combine radiocarbon dates on charcoal, bone and ivory with studies of tool types and, increasingly, ancient DNA. Estimates have shifted over time: earlier summaries described the oldest Tanana Valley sites as roughly 11,000 to 12,000 years old, while later work at Swan Point pushed the record back beyond 14,000 years [2][3].

FAQs

When did people first arrive in Alaska? Archaeological evidence such as Swan Point shows people living in Interior Alaska more than 14,000 years ago, and arrival may be earlier.

What is Beringia? A land bridge that connected Siberia and Alaska during the last Ice Age, when sea levels were lower.

What is Swan Point? An archaeological site in the Tanana Valley, over 14,000 years old, among the oldest well-documented sites in Alaska.

Who were the Ancient Beringians? A group identified from DNA of infants found at Upward Sun River, about 11,500 years old.

What are microblades? Small stone blades set into points or tools, found at early Alaskan sites and similar to Siberian technology.

Sources

1. Wikipedia: Prehistory of Alaska
2. Alaska Office of History and Archaeology: The Broken Mammoth Archaeological Project
3. University of Alaska Fairbanks: Mammoths and microblades: digging up ancient culture in Interior Alaska
4. KMXT: Ancient human remains document migration from Asia to America

Editorially reviewed by Specialty Digest Editorial TeamLast reviewed November 12, 2026Researched and drafted with AI assistanceReport an issue