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Critics argue whether or not the stone tools were actually pre-Clovis and whether or not the stone pieces had actually been hammered by humans or split apart by nature.

Archaeologists in Texas thought they’d made an important discovery in the 1990s, when they unearthed a trove of stone tools dating back 13,000 years, revealing traces of the oldest widespread culture on the continent.

But then, years later, they made an even more powerful find in the same place — another layer of artifacts that were older still.

About a half-hour north of Austin and a meter deep in water-logged silty clay, researchers have uncovered evidence of human occupation dating back as much as 16,700 years, including fragments of human teeth and more than 90 stone tools.

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Beneath the Clovis levels at the site are over 18,000 artifacts including bifaces, blades, bladelets, and other tools dating between 13,500 and 15,500 yr B. At the Manis site in northwestern Washington, the tip of a bone projectile point is embedded into the rib of a mastodon dated to 13,800 yr B. This evidence, combined with the evidence from other sites as well as human genetic data, provides a new understanding of the late Pleistocene colonization of the Americas and the origins of Clovis. The earliest was deposited between 25 and 41 cal ka.In addition to being some of the oldest yet found in the American West, the artifacts are rare traces of a culture that predated the culture known as Clovis, whose distinctively shaped stone tools found across North America have consistently been dated to about 13,000 years ago.The pre-Clovis artifacts include more than 90 stone tools, such as bifaces and blades, and more than 160,000 flakes left over from the point-making process.Topper, an archaeological site located in South Carolina, United States, is where, almost two decades ago, controversial artifacts were discovered that some archaeologists believed indicated human habitation of North America at least 3,000 years prior to the Clovis culture, previously thought to be the first inhabitants of the continent.The artifacts from the pre-Clovis stratum date to between 16 and 20 thousand years ago.

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