The technology at Cooper’s Ferry shows some similarities to technologies used in northeastern Asia during the same period, supporting the Beringian origin model for the first Americans.

The Cooper’s Ferry evidence suggests that the initial dispersal into the Americas was underway by at least 15,000 years ago.

The Manis mastodon site in Washington State produced evidence of a projectile point — made from the bone of a mastodon, a distinctive and technically demanding material — embedded in the rib of a mastodon that has been dated to approximately 13,800 calibrated years before present.

This date places it somewhat before or contemporaneous with Clovis, and the embedded bone point indicates not just human presence but active, sophisticated hunting of very large animals.