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Official websites use. Share sensitive information only on official, secure websites. Potassium-argon dating of hypogene alunite and K-mica from hydrothermally altered rocks at Goldfield, Nevada, yields mineralization ages of 20 to 21 m.
How viruses shape our world. Go Further. Ancient symbols etched onto the sides of boulders lying along the western edge of a desiccated lake in Nevada are the oldest confirmed rock carvings in North America—possibly dating back to the first peopling of the New World, scientists say.
Travel Planet Possible Inside the political battle to preserve a sprawling national forest in California. As the water levels slowly dropped, crusts of a mineral called carbonate formed on the boulders. It's unknown what method was used to create the petroglyphs, but one possibility is the artists used hard volcanic rock to chip away at the carbonate, which is porous and relatively soft, said Benson, who conducted the dating research while with the U.
Geological Survey. Animals Camels are disappearing in India, threatening a centuries-old nomadic culture. History Magazine Who were the Aztec, really? Subscriber Exclusive Content.
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The peak has yet to come. Science Coronavirus Coverage Why is Delta more infectious and deadly? Radiocarbon testing of these carbonate layers revealed them to range in age from about 14, to 10, years old. Environment Planet Possible This new technology could help cool people down—without electricity. United States Change. Environment Deadly heat, floods, drought will get worse if warming continues. They range from about 8 inches 20 centimeters up to about 3 feet 1 meter in width. The so-called petroglyphs, carved in soft limestone millennia ago, range from simple lines, pits, and swirls to more complex and ambiguous shapes that resemble diamonds, trees, flowers, and veins in a leaf.
Paid Content Prairies to peaks: hiking gems in southern Alberta. In a new study, published in this month's issue of the Journal of Archaeological Sciencegeochemist Larry Benson and his team concluded that the petroglyphs, located about 35 miles 56 kilometers northeast of Reno at Winnemucca Lake, are at least 10, years old, and perhaps as much as 14, years old.
Though Winnemucca Lake is dried up now, it was once so full of water that the boulders upon which the petroglyphs are etched were submerged. Inside the fight for animal personhood. Here are when and where to see it. New research holds answers.
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Animals How extreme heat affects our pets—and how to help them. As a result, the rock art would not have taken very long to carve, but "whether all of them were done within a short period of time or over a span of hundreds of years, I don't know," Benson said in an interview on Wednesday. Share Tweet .
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Environment Deadly heat, floods, drought will get worse if warming continues In the new IPCC report, the world's leading climate experts laid out how extreme weather will grow more common unless "drastic" cuts to emissions are made now. Here's how they persevered.
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The era of greyhound racing in the U. See how people have imagined life on Mars through history. See video of rock art in Arizona. Environment Planet Possible The deadliest flower in the insect world is a lifeline to farmers—and the planet. The carbonate ages, combined with an analysis of sediment cores taken from neighboring Pyramid Lake, suggest that the boulders were exposed to air—and thus accessible for carving by humans—between about 14, to 13, years ago, and again from about 11, to 10, years ago.
To date the petroglyphs, Benson and his colleagues began by figuring out just when they could have been made. Travel Pastis, an iconic French aperitif makes a comeback.
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Environment How extreme fire weather can cool the planet. Animals This three-legged lion is a symbol of hope. Environment Some catastrophic changes to the climate can still be headed off. Clues in Carbonate To date the petroglyphs, Benson and his colleagues began by figuring out just when they could have been made.
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Camels are disappearing in India, threatening a centuries-old nomadic culture. In between the two time periods, the boulders were submerged, the scientists say. Why are people so dang obsessed with Mars?