Ancient rock etchings along a dried-up lake bed in Nevada have been confirmed to be the oldest recorded petroglyphs in North America, dating back at least 10,000 years.
The petroglyphs found on limestone boulders near Pyramid Lake in northern Nevada’s high desert are similar in design to etchings found at a lake in Oregon that are believed to be at least 7,600 years old.
Unlike later drawings that sometimes ...
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