For Star subscribers: As challenges mount, research continues on ancient footprints in White Sands that could rewrite the story of humanity in North America.
Henry Brean When researchers shook the scientific world last year with a discovery in New Mexico that seemed to rewrite the story of humans in the Americas, they said they expected their findings to be challenged.Two new papers published within a few weeks of each other seek to cast doubt on whether fossilized human footprints unearthed at White Sands National Park are really as old as they appear to be.
In one of the papers, scientists from Kansas State University, Oregon State University, the University of Nevada, Reno, and the Nevada-based Desert Research Institute argue that radiocarbon dating of the seeds could have been skewed by ancient groundwater deposits that would have made them seem thousands of years older than they actually are, a phenomenon known as the hard-water effect.
He and the rest of the White Sands team are now gathering additional evidence they hope will cement their earlier claims. If confirmed, the discovery in New Mexico would push that arrival back by 10,000 years at least, to a time just after the Last Glacial Maximum, when a mile-high mountain of ice blocked migration into North America about 25,000 years ago.
In an article published in March, the 94-year-old Haynes, a longtime proponent of the “Clovis-first” theory, questioned the age of both the fossilized footprints and the ditch grass seeds, as well as how the seeds came to be embedded around the tracks in the first place. Springer said their trench there is now more than nine feet deep and 100 feet long. They have collected enough material from the same geological horizon as the prehistoric footprints to perform two additional kinds of age analysis.
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