By Scott Sonner
The Associated Press
PYRAMID LAKE, Nev. — 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 depict a spear or antelope, the carvings are abstract with tightly clustered geometric designs — some are diamond patterns, others have short parallel lines on top of a longer line. Scientists can’t tell for sure who carved them, but they were found on the Pyramid Lake Paiute Tribe’s reservation land.
“We initially thought people 12,000 or 10,000 years ago were primitive, but their artistic expressions and technological expertise associated with these paints a much different picture,” said Eugene Hattori, the curator of anthropology at the Nevada State Museum in Carson City who co-wrote a paper on the findings in the Journal of Archaeological Science.
The petroglyphs could be as much as 14,800 years old, said Larry Benson, a geochemist who used radiocarbon testing to date the etchings.
Radiocarbon testing dated the carbonate layer underlying the petroglyphs to roughly 14,800 years ago. Geochemical data and sediment and rock samples from adjacent Pyramid Lake show they were exposed to air from 13,200 to 14,800 years ago, and again from 10,500 to 11,300 years ago.