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Outdoors & Recreation

Mysterious Sailing Stones

Racetrack Playa, Death Valley National Park, California USA

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Sailing stones, sliding rocks, and moving rocks all refer to a geological phenomenon where rocks move in long tracks along a smooth valley floor, known as Racetrack Playa, without human or animal intervention. They have been recorded and studied in a number of places around Racetrack Playa, Death Valley, where the number and length of travel grooves are notable. The force behind their movement is not confirmed and is the subject of research for which several hypotheses exist.

The stones move only every two or three years and most tracks develop over three or four years. Stones with rough bottoms leave straight striated tracks while those with smooth bottoms wander. Stones sometimes turn over, exposing another edge to the ground and leaving a different track in the stone's wake.Trails differ in both direction and length. Rocks that start next to each other may travel parallel for a time, before one abruptly changes direction to the left, right, or even back the direction it came from. Trail length also varies – two similarly sized and shaped rocks may travel uniformly, then one could move ahead or stop in its track.

Most of the so-called sailing stones originate from an 850 ft-high (260 m) hillside made of dark dolomite on the south end of the playa, but some are intrusive igneous rock from adjacent slopes (most of those being tan-colored feldspar-rich syenite). Tracks are often tens to hundreds of feet long, about 3 to 12 inches (8 to 30 cm) wide, and typically much less than an inch (2.54 cm) deep.

A balance of specific conditions are thought to be needed for stones to move:

-a saturated yet non-flooded surface
-a thin layer of clay
-very strong gusts as initiating force 
-strong sustained wind to keep stones going

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Mysterious Sailing Stones

Racetrack Playa
Death Valley National Park, California USA

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Rated 4.0 July 6, 2014

Be prepared for spending a lot of money to get here if you don't have a jeep or somewhat intense truck! The drive out here also takes over 3 hours each way at best.
I came during the winter and wasn't allowed out there at all as the playa is still wet and can easily be damaged.

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June 8, 2014

I read that if you do want to make the drive to see the racetrack, it is best to have an all wheel drive, lower the psi of your tires to 20 psi, and don't recommend driving faster then 10 mph.

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