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"First European" Confirmed to Be 1.2 Million Years Old
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"First European" Confirmed to Be 1.2 Million Years Old
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Bianca
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Posts: 41646
"First European" Confirmed to Be 1.2 Million Years Old
«
on:
March 30, 2008, 12:37:25 pm »
An inside (left) and top view (right) show an ancient jawbone that scientists have confirmed belongs to the world's "oldest European."
The bone has been dated to about 1.2 million years ago and probably belonged to a human species unique to Europe, researchers say.
Photographs by EIA/Jordi Mestre
/courtesy Nature
"First European" Confirmed to Be 1.2 Million Years Old
James Owen
for National Geographic News
March 26, 2008
An analysis of an ancient jaw containing teeth has confirmed that humans reached Western Europe well over a million years ago, far earlier than previously thought.
The prehistoric fossil was excavated last June at Atapuerca in northern Spain, along with a previously reported tooth and stone tools used for butchering meat.
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At the time, scientists announced that they had dated the separate tooth to 1.2 million years ago but that more research was needed before the find could be reported in a scientific journal.
The new study of the jaw confirms that the "first Europeans" arrived well over a million years ago, reports the archaeological team—led by Eudald Carbonell of the Rovira i Virgili University in Tarragona, Spain—in the latest issue of the journal Nature.
The jaw's owner has been labeled a Homo antecessor—a species first named in 1997 based on other human fossils found at Atapuerca. The sex isn't known, but the new human was likely aged between 30 and 40 at the time of death.
"Since we now know those [1997] fossils date to 900,000 [years ago], the time difference is not great, and, provisionally at least, I think it's logical to assign the mandible to Homo antecessor," said dig co-director José Maria Bermúdez de Castro of the National Research Center on Human Evolution in Burgos, Spain.
The new findings suggest that H. antecessor was most probably unique to Europe, the researchers say.
Bone Breakers
The lower jawbone was discovered inside a 60-foot-long (18-meter-long) cave known as Sima del Elefante. The region was originally exposed by a railway cutting through a limestone area rich in early hominin, or human, and animal remains.
The complex of fossils allowed scientists to use a variety of methods to confirm the age of the fossils, including magnetic analysis, radioactive dating, and geologic studies of the clustered bones and artifacts—a necessity because the dating of human fossils remains a controversial area of research.
For example, 32 stone flints also excavated from the cave date to the same age as the fossils, according to Bermúdez de Castro said.
The flints include simple tools that were likely used by the early humans to hack up mammal carcasses and get at bone marrow, as evidenced by cut marks found on nearby limb bones belonging to unidentified herbivores.
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Bianca
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Re: "First European" Confirmed to Be 1.2 Million Years Old
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March 30, 2008, 12:43:34 pm »
"They used the stone tools to take meat off animals, cut the muscles, and break their bones," Bermúdez de Castro said. "The bones show the marks of these implements."
Remains of other close-by animals—including rhinoceroses, deer, bison, lynx, wolves, and bears—were also used to help date the fossils, the study said.
New Species
The research opens an interesting new chapter in the story of European colonization, the study authors say.
The earliest known human fossils found outside of Africa are from Dmanisi in the modern-day Republic of Georgia. Identified as either Homo erectus or Homo ergaster, the remains date to around 1.8 million years ago.
"The Republic of Georgia is at the gates of Europe," Bermúdez de Castro said. "It's the crossroads between Africa and Eurasia from a geographical point of view."
But H. erectus fossils estimated to be 1.6 million years old have been located as far away as Java in Indonesia, he noted.
Because of that, "we think that in Europe we are going to find more hominin fossils probably older than those of Sima del Elefante," Bermúdez de Castro said.
The Spanish-led team adds that the new fossil human likely marks the beginnings of a native European species represented by the younger finds at Atapuerca.
"We see that these fossils are different from other populations in Asia or in Africa," Bermúdez de Castro said.
"We think that when populations come to an extreme part of a continent, or to an island, a process of speciation usually occurs," he added. "This is very normal in the animal world."
The Atapuerca researchers in 1997 had suggested Homo antecessor as a possible ancestor of modern humans. But the age of the new fossil find makes this theory less likely, Bermúdez de Castro admitted.
"Homo antecessor may be very, very old in Europe, and modern humans came from Africa," he said, making the previous theory "difficult to support."
More likely, Homo antecessor gave rise to Neandertals (often spelled Neanderthals) in Europe, he said, adding, "it's a good hypothesis to test in the future."
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Bianca
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Re: "First European" Confirmed to Be 1.2 Million Years Old
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March 30, 2008, 12:44:52 pm »
"Important and Exciting Find"
Fred Spoor, professor of evolutionary anatomy at University College London, said the new fossil, assuming its dating is accurate, marks "undoubtedly a very important and exciting find."
While stone tools had suggested a human presence in Spain around a million years ago, convincing fossil evidence had previously been lacking, Spoor commented.
He also described the jaw as "remarkably modern looking" compared with similar or younger hominin fossils known from Africa.
"If we would find this kind of mandible in Africa, we would be a bit surprised," Spoor said.
He added that the idea that the Atapuerca hominins represent a distinct European species is entirely plausible, given that the region would have been a far-flung human outpost.
"Spain is about the furthest point you could go to the west," Spoor said. "It's a bit of a cul-de-sac, so in that sense you would get speciation where something wanders off on its own."
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