These are not ordinary moving rocks that tumble down mountainsides in avalanches, are carried along riverbeds by flowing water, or are tossed aside by animals.
These rocks, some as heavy as 700 pounds, are inexplicably transported across a virtually flat desert plain, leaving erratic trails in the hard mud behind them, some hundreds of yards long.
They move by some mysterious force, and in the nine decades since we have known about them, no one has ever seen them move.
Until now that is!
One cold winter morning, when the snowmelt covered the playa, the solution to the puzzle was finally caught on film.