White Sands National Park in New Mexico has produced what may be the most striking recent addition to the pre-Clovis evidence: footprints — actual human footprints, preserved in ancient lake sediment — that have been dated by multiple methods, including the radiocarbon dating of seeds embedded in the sediment at the level of the footprints, to approximately 21,000 to 23,000 years before present.

These dates, if sustained, would push the evidence for human presence in the Americas back substantially further than the Paisley evidence.

The White Sands footprint dating has been questioned by some researchers on methodological grounds — concerns about the specific radiocarbon reservoir effects in ancient lake sediment — and the debate continues.

And from the Yukon, Bluefish Caves has produced directly dated, human-modified animal bones at approximately 24,000 calibrated years before present — evidence, as discussed elsewhere in this series, of human presence in eastern Beringia during the Last Glacial Maximum.

Paisley fits into this picture as a particularly well-documented piece of evidence with multiple independent lines of confirmation.