(CNN) – A team of scientists in Chile say they found a human footprint, which has more than 15,000 years old – the oldest one ever found in the Americas.
Opening casts doubt on previous terms and map the migration of people in South America. Most of the evidence believed that people are not reached in Patagonia at the southern tip of South America up to 12,000 years ago, Karen Moreno, one of the study co-authors, CNN reported.
The track was found in 2010 at the Palais archaeological excavations in the city of Osorno in southern part of the country, on the edge of development in the home. But it took years for scientists to confirm the age of the fossils by dating.
Scientists have been warned about the wealth area after construction, digging to build houses, they began to tear off the treasures hidden beneath the surface.
A new wave of research going on there since 1986 and discovered the remains of large animals, mastodons from the horses to the Palais-Lama, a large species Lama, who & # 39 is now gone.
But the old man trail was perhaps the biggest prize.
Confirming age Imprint took eight years
colleague Moreno, Mario Pino, found the trail just before Christmas in 2010.
In order to accurately determine the age of the fingerprint, the team used radiocarbon dating techniques to find the age of the tree, seeds and bones found around experience. They also found evidence of primitive stone tools in the area of mining.
They identified the species as Hominipes Modernus, which is closely related to Homo sapiens.
Experiments on the organic material around the track created a range of possible dates, with the median age pinning print for about 15,600 years.
But more than eight years passed between the publication of the track spotting and proof of age. Moreno said the team spent the time "trying to convince his colleagues that this trail."
Over time, the evidence became compelling, she said. "We have confirmed and checked and re-checked."
Moreno said there was "a lot of difficulties" to convince colleagues, how is it possible for people to be around 3,000 years earlier than previous traces of nomadic culture Clovis, which existed in the area.
In the end, the reviewers were happy.
Nakhodka rewrites the migration card man
It took millions of years for human feet to walk to America. In the end they crossed the Bering Strait from Russia to Alaska today during the last glacial period.
"If we have evidence of people to this, we have to figure out how they got there," Moreno said.
But much of this evidence, if it exists, is now probably at the bottom of the sea. the sea level was lower than 15,000 years ago.
"Most of the evidence is under water or was blown up by glaciers," Moreno said.