Their work may even date back to around 9,500 years ago. engineering
. From this conclusion, Pompeani believes this to be one of the world's oldest, if not the oldest, copper-working cultures.Another fascinating point Pompeani and his team make is that regional climate might have played a part in explaining why the people living in the Old Copper Culture abruptly stopped their metalwork — something that has been baffling scientists for a while.
A vast number of copper tools have been found over the centuries around the Great Lakes, as Native Americans learned to use ore, heat, and hammering to create copper tools from the abundant pure copper deposits in the region. Up until now, it was believed that Native Americans started creating tools in this way some 6,000 years ago, and then stopped about 3,000 years ago.
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