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Researchers found that petroglyphs discovered in western Nevada are at least 10,500 years old, making them the oldest rock art ever dated in North America.

Researchers found that petroglyphs discovered in western Nevada are at least 10,500 years old, making them the oldest rock art ever dated in North America.

(Huffington Post Science)

On the west side of Nevada’s dried-up Winnemucca Lake, there are several limestone boulders with deep, ancient carvings; some resemble trees and leaves, whereas others are more abstract designs that look like ovals or diamonds in a chain.
The true age of this rock art had not been known, but a new analysis suggests these petroglyphs are the oldest North America, dating back to between 10,500 and 14,800 years ago.
Though Winnemucca Lake is now barren, at other times in the past it was so full of water the lake would have submerged the rocks where the petroglyphs were found and spilled its excess contents over Emerson Pass to the north.

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