New Evidence Suggests Humans Arrived In The Americas Far Earlier Than Thought | KERA News

New Evidence Suggests Humans Arrived In The Americas Far Earlier Than Thought

Apr 26, 2017
Originally published on April 26, 2017 6:54 pm

Researchers in Southern California say they've uncovered evidence that humans lived there 130,000 years ago.

If it's true, it would be the oldest sign of humans in the Americas ever — predating the best evidence up to now by about 115,000 years. And the claim has scientists wondering whether to believe it.

In 1992, archaeologists working a highway construction site in San Diego County found the partial skeleton of a mastodon, an elephant-like animal now extinct. Mastodon skeletons aren't so unusual, but there was other strange stuff with it.

"The remains were in association with a number of sharply broken rocks and broken bones," says Tom Deméré, a paleontologist at the San Diego Natural History Museum. He says the rocks showed clear marks of having been used as hammers and an anvil. And some of the mastodon bones as well as a tooth showed fractures characteristic of being whacked, apparently with those stones.

It looked like the work of humans. Yet there were no cut marks on the bones showing that the animal was butchered for meat. Deméré thinks these people were after something else. "The suggestion is that this site is strictly for breaking bone," Deméré says, "to produce blank material, raw material to make bone tools or to extract marrow." Marrow is a rich source of fatty calories.

The scientists knew they'd uncovered something rare. But they didn't realize just how rare for years, until they got a reliable date on how old the bones were by using a uranium-thorium dating technology that didn't exist in the 1990s.

The bones were 130,000 years old. That's a jaw-dropping date, as other evidence shows that the earliest humans got to the Americas about 15,000 to 20,000 years ago.

"That is an order of magnitude difference. Wow," says John Shea, an archaeologist at New York's Stony Brook University who specializes in studying ancient toolmaking. "If it's correct, then there's an extraordinarily ancient dispersal to the New World that has a very different archaeological signature from anything left behind by recent humans."

Shea says it's different because Stone Age toolmakers usually leave behind stone flakes — sharp pieces broken or "knapped" from certain kinds of rock that serve as cutting implements. There were none at the California site. Another odd thing: no signs that the mastodon was butchered for the meat.

"This is weird," Shea says. "It's an outlier in terms of what archaeological sites from that time range look like everywhere else on the planet." He suggests these bones might have been broken up by natural causes — by a mudflow, perhaps, or by the trampling of animals sometime after the mastodon died.

Another skeptic is John McNabb, an archaeologist at the University of Southampton in England. His question: How did those people get to California?

Twenty thousand years ago, archaeologists agree, people did cross over to Alaska from Siberia, perhaps more than once. Sea levels were lower then and there was a land bridge connecting the continents. In an interview with the journal Nature, which published the California research, McNabb says that land bridge wasn't there 130,000 years ago. "The sea lane in between the two continents [was] wider [then]," he says, "so that's one problem with this: How do we get humans across?"

McNabb says what's needed to really prove that this is truly an archaeological site are bones from the people who got there.

The California team counters that it has spent over 20 years examining the evidence. "I know people will be skeptical with this because it is so surprising," says team member and archaeologist Steve Holen, "and I was skeptical when I first looked at the material myself. But it's definitely an archaeological site."

Holen, with the Center for American Paleolithic Research, says these early people could have come across in boats. As for the broken bones, he says the type of fracture isn't accidental. And the way the hammerstones and bones were distributed in the ground doesn't look natural.

One question the team can't answer is who these people were. A genetic technique that uses mutations in a population's genome as a sort of "clock" says the first common ancestor of Native Americans lived about 20,000 years ago. So if there were indeed earlier settlers, it could be they made an arduous migration from Siberia, only to die out without leaving any descendants.

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ARI SHAPIRO, HOST:

Artifacts found in Southern California have puzzled scientists for years. Some now say they are proof that humans lived in the area 130,000 years ago, well before anyone thought. That would make them the oldest evidence of humans in the Americas ever. As NPR's Christopher Joyce reports, scientists are wondering whether or not to believe it.

CHRISTOPHER JOYCE, BYLINE: In 1992, archaeologists working on a highway construction site found a partial skeleton of a mastodon, an elephant-like animal now extinct. Mastodon skeletons aren't that unusual, but there was other strange stuff with it.

TOM DEMERE: The remains were in association with a number of sharply broken rocks and broken bones.

JOYCE: Tom Demere is a paleontologist at the San Diego Natural History Museum. He says the rocks showed clear marks of having been used as a hammer and anvil. And some of the mastodon bones as well as a tooth showed fractures characteristic of being whacked with those stones. It looked like the work of humans, yet there were no cut marks on the bones showing that it was butchered for meat. Demere thinks these people were after something else.

DEMERE: The suggestion is that this site is strictly for breaking bones to produce blank material, raw material to make bone tools or to extract marrow.

JOYCE: The scientists knew they'd uncovered something rare, but they didn't realize just how rare for years until they got a reliable date on how old the bones were - 130,000 years old. Now, that's a jaw-dropping date because the best evidence up to now shows that the earliest humans got here about 15,000 to 20,000 years ago.

JOHN SHEA: That's an order of magnitude difference. That is - wow.

JOYCE: John Shea is an archaeologist at Stony Brook University.

SHEA: If it's correct, then there is an extraordinary ancient dispersal to the New World that has a very different archaeological signature.

JOYCE: Shea says it's different because Stone Age humans usually leave behind sharp flakes - bits of stone used for cutting. There were none at the California site. Another odd thing - no signs that the mastodon was butchered.

SHEA: This is weird. It's an outlier in terms of what archaeological sites from that time range look like everywhere else on the planet.

JOYCE: Shea suggests that these bones might have been broken naturally by a mudflow or trampled by animals. Also skeptical is John McNabb, an archaeologist at the University of Southampton in England. He wondered how these people got here.

Twenty thousand years ago, people did cross over to Alaska from Siberia. Sea levels were lower, and there was a land bridge. In an interview with the Journal Nature, which published the research, McNabb's says that land bridge was not there 130,000 years ago.

JOHN MCNABB: The sea lane in between the two continents is wider. So that's one problem with this. How do we get humans across?

JOYCE: The California team says they're sure of their conclusion. Archaeologist Steve Holen is with the Center for American Paleolithic Research.

STEVE HOLEN: I know people will be skeptical of this because it is so surprising, and I was skeptical when I first looked at the material myself. But it's definitely an archaeological site.

JOYCE: Holen says these early people could have come across in boats. As for the broken bones, he says the types of fractures are not accidental. One question the team cannot answer is, who were these people? Genetic studies indicate that the first ancestors of Native Americans date back only to 20,000 years. If there were indeed earlier settlers, it could be they died out without leaving any descendants. Christopher Joyce, NPR News. Transcript provided by NPR, Copyright NPR.