This date, which would be refined through subsequent work, made the Upward Sun River infants among the oldest human remains found in Alaska and among the earliest from anywhere in North America that have yielded recoverable ancient DNA.

The implications of that date extended well beyond Alaskan archaeology.

At 11,500 years ago, the last Ice Age had recently ended.

The ice sheets that had covered much of North America were in retreat, though residual glaciation remained in many areas.

The Bering land bridge — the broad land connection between northeastern Asia and Alaska that had been exposed during the lowered sea levels of the glacial maximum — was in the process of being submerged as sea levels rose.

The landscape of Alaska was in rapid ecological transition, with the cold, dry steppe-tundra of the late Pleistocene giving way to the wetter, more forested conditions of the Holocene.