Determining Age of Oldest Known North American Petroglyphs
Researchers have been busy studying the oldest known petroglyphs in North America, in western Nevada. The petroglyphsn are known to be as old as 10,500 years.
The research has been conducted by the scientists of University of Colorado, Boulder. The scientists have been studying date of the stone carvings. For determining the same, they are observing the ancient water levels.
Their study touched the 3,960-foot elevation of the petroglyphs at the Winnemucca Lake site recently. After the lake level was at this height, petroglyph boulders penetrated and were not found again.
The researchers explained that the white layer of carbonate made up of limestone precipitated from the Winnemucca Lake. So, this exhibited that the limestone boulders contained the petroglyphs.
After scrutiny, they found that it was exposed to air between 14,800 and 13,200 years ago. A little penetration into the subject displayed that they existed approximately between 11,300 and 10,500 years ago.
According to one of the researchers, "Prior to our study, archaeologists had suggested these petroglyphs were extremely old. Whether they turn out to be as old as 14,800 years ago or as recent as 10,500 years ago, they are still the oldest petroglyphs in North America".
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