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"We have no idea what they mean," Benson said of the Winnemucca Lake petroglyphs.

"But I think they are absolutely beautiful symbols.

The oldest dates calculated for the Winnemucca Lake petroglyph site correspond with the time frame linked to several pieces of fossilized human excrement found in a cave in Oregon, said Benson, who also is affiliated with CU's Institute of Arctic and Alpine Research.

The caves, known as the Paisley Caves in south central Oregon, held not only fossilized human coprolites that dated to roughly 14,400 years ago, but also bones of horses and camels that went extinct in North America prior to 13,000 years ago.

A new high-tech analysis led by a University of Colorado Boulder researcher shows the oldest known petroglyphs in North America, which are cut into several boulders in western Nevada, date to at least 10,500 years ago and perhaps even as far back as 14,800 years ago.

The petroglyphs located at the Winnemucca Lake petroglyph site 35 miles northeast of Reno consist of large, deeply carved grooves and dots forming complex designs on several large limestone boulders that have been known about for decades, said CU-Boulder researcher Larry Benson, who led the new effort.

This course strives to provide the student with a variety of specific learning outcomes.

The domain "colorado.edu" is added to the system so you should not have any problems, but please let me know as soon as possible if you have trouble downloading the software. If you run another OS, you will have to run it in a virtual machine.Founded in 2002 by Nobel Laureate Carl Wieman, the Ph ET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations.Ph ET sims are based on extensive education research and engage students through an intuitive, game-like environment where students learn through exploration and discovery. The radiocarbon dates on the samples indicated the carbonate layer underlying the petroglyphs dated to roughly 14,800 ago.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.The younger time interval calculated for the Winnemucca petroglyphs corresponds to dates obtained from a second significant archaeological finding in the region -- Spirit Cave Man, who was discovered more than 70 years ago some 60 miles east of Reno and whose hair, bones and clothing were dated to about 10,600 years ago.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.At least one of the petroglyph panels from Long Lake was buried by ash from an eruption of the nearby Mount Mazama volcano roughly 6,700 years ago, proof that it was carved sometime before the eruption."Prior to our study, archaeologists had suggested these petroglyphs were extremely old," said Benson, also an emeritus USGS scientist."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 that have been dated in North America." While Native American artifacts found in the Lahontan Basin -- which encompasses the Winnemucca Lake subbasin -- date to the time period of 11,300 to 10,500 years ago, it does not rule out the possibility that the petroglyphs were carved as early as 14,800 years ago, Benson said.They found the infants had different mothers and were the northernmost known kin to two ... Only the data you took should be the same among reports from the same lab group.NI/AWR has generously allowed our class to obtain free licenses.Please follow the instructions below to obtain a license for your computer:".

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