White Sands has benefited from a relatively constructive engagement between those who raised methodological concerns and those who addressed them, resulting in a richer and more defensible body of evidence than either the 2021 paper alone or the critical response alone would have produced.

For readers who are not scientists, this process can look like confusion or contradiction — “scientists said one thing, now they say another, which is it?” But the revision of conclusions in response to new evidence is not confusion.

It is the characteristic feature of a self-correcting system of knowledge.

The White Sands story, including its dating controversy and its resolution, is an example of that system working as it should.

The conclusion that emerged from this process — that people were at White Sands during the Last Glacial Maximum, approximately 21,000 to 23,000 years ago — is supported by more evidence and more methodological rigor than the original claim was, precisely because the original claim was challenged and the challenge was taken seriously.

After The Glaciers Melted