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Study: The First Americans Didn't Arrive by the Bering Land Bridge

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Stone projectile points discovered at Oregon's Rimrock Draw rockshelter. One may be at least 15,800 years old. Image credit: Katrina Lancaster // Bureau of Land Management // CC BY 2.0

For much of the 20th century, scientists believed that the first settlers of the Americas could only have arrived one way. As the conventional story went, an ice-free super highway opened up across the Bering Land Bridge toward the end of the last ice age, allowing people from Eurasia to follow big game like bison and mammoths down through the interior of North America.

New archaeological discoveries have challenged that narrative in recent years. And a study published in the journal Nature offers further evidence that this northerly corridor wasn’t the first route to the continent.

University of Copenhagen researchers Eske Willerslev, Mikkel Pedersen, and their colleagues found that this harsh route only became viable for human migration 12,600 years ago—when the first plants and animals showed up in the region. Meanwhile, archaeologists have ample evidence that people were living in the Americas long before then.

“We know conclusively that human groups were in the interior before that date—perhaps as early as 15,000 calibrated radiocarbon years before present—so it is highly unlikely that they came south through the corridor,” said Michael O’Brien, an anthropologist and current academic vice president of Texas A&M University–San Antonio, who wasn’t involved in the study. “A more likely scenario is that they came south along the Pacific coast.”

For the study, Pedersen and colleagues drilled sediment cores from beneath the frozen surface of two lakes in western Canada: Charlie Lake and Spring Lake. These were among the last areas to lose their ice cover when the two huge ice sheets that blanketed the region (the Laurentide and Cordilleran ice sheets) split during the end of the last glacial maximum, around 15,000 years ago. The retreating ice opened up a path some 1500 kilometers long into the interior of North America.

With the sediment cores, the scientists were able to reconstruct a history of environmental conditions along this route based on algae, pollen and other plant matter, fossils, and ancient DNA trapped in the layers of chilly soil. They concluded that before 12,700 years ago, patchy grass was the only life along the ice-free route. Slowly, plants like sage brush and willow started to change the barren corridor into a steppe landscape. By 12,600 years ago, bison arrived. About 2000 years later, the route started to look more lively as it became populated by jackrabbits, voles, and other small mammals, which were followed by mammoths, elk, and predators like bald eagles. The route likely became impassable for humans and big mammals again about 10,000 years ago, when dense coniferous forests started to grow.

The results of the study suggest the route was only usable between 12,600 and 10,000 years ago. This narrow window is too late to match with the once-prevailing “Clovis First” hypothesis. The Clovis people, who are named after their characteristic fluted stone spearheads first found near Clovis, New Mexico, were thought to have been the first inhabitants of the Americas. The earliest Clovis points show up in the archaeological record about 13,500 years ago. It was long believed that they got here by crossing the Bering Land Bridge sometime before then.

Recently, several before-Clovis sites have been discovered in the Americas. Fossilized feces more than 14,000 years old have been found in Oregon’s Paisley Caves. Stone tools alongside mastodon bones in Florida were recently found to be 14,550 years old. And much further away from northwestern Canada, in southern Chile, humans inhabited Monte Verde at least 14,000 years ago (and possibly even earlier).

Alternate migration routes have been put forth in the past, such as the controversial Solutrean hypothesis, which posits that the first Americans actually came from Europe, not Asia, via a North Atlantic route. But many anthropologists now favor a Pacific coastal route to explain how the first people got to the Americas, though more research is needed to fully understand how these intrepid settlers traveled (perhaps by boat).

“Such a study has been needed for quite some time now,” said Vanderbilt College archaeologist Tom Dillehay, who wasn’t involved in the new study. Dillehay, whose excavations at Monte Verde in the 1970s revealed the site's ancient age, challenging the Clovis First theory—and long considered suspect as a result—told mental_floss that this type of study is just the beginning. “I would like to see more studies of this nature done in other areas of the corridor to confirm this hypothesis—especially at the entrance and exits points of the corridor.”

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Stones, Bones, and Wrecks
Found: A Sunken German World War I-Era Submarine
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SMU Central University Libraries, Flickr/Public Domain

During World War I, one of Germany's most formidable weapons was the U-boat, an advanced military submarine with torpedoes that sank countless Allied merchant and cargo ships. But while deadly, these submersibles weren't invincible, as evidenced by the recent discovery of a sunken German U-boat in the North Sea.

As ABC News reports, researchers located the UB II-type dive boat—a smaller submarine that typically plagued coastal waters—off the coast of Belgium, around 82 to 98 feet below the North Sea. The 88-foot vessel appears to have struck a mine with its upper deck, judging by damage suffered to its front.

The submarine is remarkably intact. Two of its torpedo tubes were destroyed, but one of them is still in good condition. The ship itself remained sealed, and may serve as a watery grave for up to 23 crew members.

The U-boat's final resting place hasn't been announced, as to prevent looting or damage, according to the BBC. Meanwhile, Belgian officials have contacted the German ambassador to see how they should proceed with any potential remains.

This isn't the first time a World War I-era U-boat has been found in Belgian waters. Experts have catalogued 11 such discoveries so far, but this one is reported to be the best preserved. The Chicago Tribune reports that since 18 U-boats were stationed in Bruges between 1915 and 1918, and 13 of them were destroyed, there might be even more of these kinds of finds to come.

[h/t ABC News]

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Cotswold Archaeology
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Stones, Bones, and Wrecks
Amateur Archaeologists in England Unearth Rare Roman Mosaic
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Cotswold Archaeology

For the past three years, amateur archaeologists and historians in southern England have been working side-by-side with volunteers to excavate several seemingly related local Roman sites. Now, just two weeks before the dig's scheduled conclusion, they've made a fantastic discovery: a rare 4th-century CE mosaic that is being hailed as "the most important of its type in Britain in more than half a century," according to The New York Times.

Dating to roughly 380 CE, the mosaic was unearthed near the village of Boxford in Berkshire. The project—which included a rotating assembly of 55 members—involved local interest groups like the Boxford History Project and the Berkshire Archaeological Research Group, and was overseen by Cotswold Archaeology, a company that helps builders preserve archaeological finds. Funding was provided by the Heritage Lottery Fund, which gives grants to heritage projects across the UK.

In the project's first two years, the group members discovered a large Roman villa, a bathhouse, and a farmstead. In 2017, they began excavating the main villa, a site that yielded pottery, jewelry, coins, and other ancient objects. None of these artifacts, however, were as spectacular as the mosaic, which volunteers unearthed in a moment of serendipity shortly before funding for the dig ended.

Revealed sections of the artwork depict scenes featuring Bellerophon, a mythological Greek hero, along with other fabled figures. Bellerophon is famous in legends for capturing the winged horse Pegasus and for defeating the Chimera, a fire-breathing creature with a lion's head, a goat's body, and a serpent's tail.

Citizen archaeologists in Boxford, England unearth a Roman mosaic thought to date from 380 CE.
Cotswold Archaeology

"The range and style of imagery is very rare in the UK, where simple geometric patterns are the norm," Duncan Coe, a principal heritage consultant with Cotswold Archaeology, tells Mental Floss. "The combination of artwork and inscriptions is unique in this country. The range of imagery is also unique, with at least two scenes from the story of Bellerophon, a character from Greek mythology, augmented by Hercules and the Centaur, Cupid and telamones [male statues used as a column]—and we only have half of the mosaic revealed so far."

Excavators uncovered nearly 20 feet of the mosaic, but ultimately reburied it to deter looters and prevent damage. Members of Boxford's local archaeological community hope to secure funding and return to the site—now dubbed the Boxford villa—to dig up the entire scene.

A Roman mosaic thought to date from 380 CE, unearthed by citizen archaeologists in Boxford England.
Cotswold Archaeology

In addition to teaching experts about the villa's owners—who were evidently sophisticated and wealthy—and Boxford's ancient heritage, the newly discovered mosaic isn't just any ordinary artwork, according to Coe: "This isn't just an isolated mosaic, but a small, but very important, part of a bigger jigsaw that advances our understanding of what was happening in southern England just before the Roman government abandoned Britain," he says.

[h/t The New York Times]

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