This is science at its best: responsive to criticism, methodologically sophisticated, and willing to do the additional work required to build a case that is genuinely robust rather than simply repeated more loudly.

The Paisley coprolites began as a remarkable claim backed by one line of evidence.

They have become a substantially confirmed contribution to pre-Clovis archaeology backed by multiple independent convergent lines of evidence.

The difference is twelve years of hard work by researchers who took the criticisms seriously enough to answer them properly.

What Comes Next

The broader question of pre-Clovis human presence in the Americas is far from settled, and the Paisley evidence — significant as it is — is one contribution to a debate that continues to evolve as new sites are investigated, new methods are applied, and new ancient DNA data is generated from Indigenous ancestors and their northeastern Asian relatives.

The specific question of routes into the Americas — how the founding populations moved from Beringia into the ice-free parts of North America — is one that the Paisley evidence alone cannot resolve.