Fossilized Footprints dating to ~23k years ago, White Sands, NM

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Astronuc
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https://www.nps.gov/whsa/learn/nature/fossilized-footprints.htm
How long have humans been living in the Tularosa Basin? The latest research from White Sands confirms for the first time that humans have been living in North America for at least 23,000 years - many thousands of years older than previously thought. This research also confirms that people were living with the ice age megafauna much longer than previously known.

The new dates of the human presence were discovered by digging a trench in the gypsum soil on the park's western playa. Human footprints were found at different depths below the surface. Above and below these nearly discovered human footprints were ancient grass seeds (Ruppia cirrhosa). These seeds were analyzed using radiocarbon dating, and calibrated dates of 22,860 (∓320) and 21,130 (∓250) years ago were revealed.

https://phys.org/news/2021-09-fossil-footprints-humans-populated-americas.html
Our discovery may also reopen speculation about other archaeological sites in the Americas. One of them is Chiquihuite Cave in Mexico. Archaeologists recently claimed that evidence from this cave suggests humans occupied the Americas around 30,000 years ago—7,000 years before people left the White Sands footprints.

But the Chiquihuite Cave findings are disputed by some, as stone tools can be difficult to interpret and tool-like stones can form via natural processes. Stone tools can also move between layers of sediment and rock. Fossil footprints can't. They are fixed on a bedding plane, and so provide more reliable evidence of exactly when humans left them.

https://www.science.org/doi/10.1126/science.abg7586 (subscription needed for full article)

https://www.nature.com/articles/d41586-021-02597-1

Edit/update: I realized yesterday evening that the time period predates the Bonneville and Missoula floods. These people, or rather their descendents, would have witnessed dramatic changes.
https://pubs.er.usgs.gov/publication/70217223
 
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