These vehicles have strong roots in Boulder dating back to 1972.Jeep’s Wrangler has been so popular that it has surpassed both Cherokee and Grand Cherokee sales.Benson and his colleagues used several methods to date the petroglyphs, including determining when the water level the Winnemucca Lake subbasin -- which back then was a single body of water connecting the now-dry Winnemucca Lake and the existing Pyramid Lake -- reached the specific elevation of 3,960 feet.
"We have no idea what they mean," Benson said of the Winnemucca Lake petroglyphs.The remains of the man, who was found partially mummified in a shallow grave in Spirit Cave, Nev., were discovered with a fur robe, a woven marsh plant shroud and moccasins.Petroglyphs near Long Lake in central Oregon -- which were previously thought to be the oldest examples of rock art in North America -- share similar features with some of the rock art the Winnemucca site, said Benson."But I think they are absolutely beautiful symbols.Some look like multiple connected sets of diamonds, and some look like trees, or veins in a leaf.
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Those dates, as well as additional geochemical data on a sediment core from the adjacent Pyramid Lake subbasin, indicated the limestone boulders containing the petroglyphs were exposed to air between 14,800 and 13,200 years ago and again between about 11,300 and 10,500 years ago.