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Humans reached Americas 100,000 years earlier than thought

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tks

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Source : Nature Magazine

http://www.nature.com/news/controve...pJobID=1144583319&spReportId=MTE0NDU4MzMxOQS2

April 26, 2017

Controversial study claims humans reached Americas 100,000 years earlier than thought
Broken mastodon bones hint that Homo sapiens wasn’t the first hominin to get to the New World.

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Ancient humans settled in North America around 130,000 years ago, suggests a controversial study — pushing the date back more than 100,000 years earlier than most scientists accept. The jaw-dropping claim, made in Nature1, is based on broken rocks and mastodon bones found in California that a team of researchers say point to human activity.


Their contention, if correct, would force a dramatic rethink of when and how the Americas were first settled — and who by. Most scientists subscribe to the view that Homo sapiens arrived in North America less than 20,000 years ago. The latest study raises the possibility that another hominin species, such as Neanderthals or a group known as Denisovans, somehow made it from Asia to North America before that and flourished.


“It’s such an amazing find and — if it’s genuine — it’s a game-changer. It really does shift the ground completely,” says John McNabb, a Palaeolithic archaeologist at the University of Southampton, UK. “I suspect there will be a lot of reaction to the paper, and most of it is not going to be acceptance.”


The study focuses on ancient animal-bone fragments found in 1992 during road repairs in suburban San Diego. The find halted construction, and palaeontologist Tom Deméré of the San Diego Natural History Museum led a five-month excavation. His crew uncovered teeth, tusks and bones of an extinct relative of elephants called a mastodon (Mammut americanum), alongside large broken and worn rocks. The material was buried in fine silt left by flowing water, but Deméré felt the rocks were too large to have been carried by the stream.

(For more read the story at the link provided at the top of this post)
 
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