last glacial maximum
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Oldest Human Footprints in North America Really Are That Old, New Dating Confirms
Fossilized human footprints at White Sands National Park in New Mexico are every bit as old as the 23,000 years-and-change they were dated at in 2021, according to analysis published in Science. Back in 2021, researchers published work in which they used radiocarbon dating of crushed seeds of Ruppia cirrhosa, an aquatic grass, to date…