For years, enormous stones have been moving across the Racetrack Playa of Death Valley National Park, leaving engraved trails in the muddy surface behind. No one understood how, though there was plenty of speculation, according to researchers at the Scripps Institution of Oceanography at University of California San Diego.
Last year the researchers, Richard Norris and James Norris, placed stones equipped with GPS devices on the same stretch of land, then waited and watched.
“We recorded the first direct scientific observation of rock movements using GPS-instrumented rocks and photography, in conjunction with a weather station and time-lapse cameras,” the authors wrote in a study published in the journal PLOS One.
On Dec. 20, 2013, they witnessed 60 rocks move across the land.
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