A distinct Arctic maritime adaptation (often called the Thule tradition) developed along the northern Alaskan coast, featuring technologies such as skin boats, dog traction, and sophisticated sea-mammal hunting that later enabled long-distance movement east.
Archaeological syntheses place the start of a major population movement of Thule Inuit from the western Arctic at about A.D. 1200, expanding across the North American Arctic very quickly (often characterized as within a generation).
As the eastward expansion proceeded, Thule groups spread through the central and eastern Arctic of Canada, carrying maritime hunting toolkits and transport systems that supported seasonal mobility and larger winter settlements.
Reference works commonly summarize the Thule movement as reaching Greenland by the 12th century, marking a key stage in the peopling of Greenland by Inuit ancestors and setting the stage for later spread around Greenland’s coasts.
Greenland’s National Museum & Archives describes Thule people—ancestors of present-day Greenlanders—as coming from Alaska to Greenland around 1200, then continuing their migration through the island using efficient transport (e.g., umiaq, kayak, dog sledge).
In the High Arctic/Smith Sound region, Thule expansion overlapped with Late Dorset populations during the 13th century; sources commonly describe this as a period when Dorset communities were declining and were later replaced across much of the region.
Archaeological interpretation of the Ruin Island site (northwest Greenland) places Thule arrival there roughly 1280–1330, illustrating the spread of Thule settlement into the far northwest and its role in later “Ruin Island phase” studies.
Summaries of Greenland’s settlement history commonly describe Thule expansion beyond northwest/west Greenland to the east coast by about 1300, reflecting continued coastal dispersal and adaptation to varied regional ecologies.
Accounts of Greenland’s medieval period often note that Thule migrants became the dominant population by about 1300, as Inuit settlement expanded around coasts while Norse communities remained concentrated in the southwest fjords.
Narratives comparing Norse and Thule presence in Greenland commonly place Thule movement into areas near the Norse Western Settlement by the mid-14th century, roughly coinciding with the period when Norse activity there diminished and ultimately ended.
A wedding recorded at Hvalsey in September 1408 is widely cited as the last contemporaneous written mention of the Norse Greenlanders; afterward, the Norse colonies fade from written sources while Inuit (Thule-descended) communities persisted.
Radiocarbon dating places the deaths of the Qilakitsoq Inuit (Thule cultural tradition) at about A.D. 1475 (± ~50 years), providing unusually detailed evidence for clothing, health, and lifeways in Greenland during the late phase of Thule-era settlement.
Thule Migration to Greenland and North America (c. 1000–1500 CE)
