🇺🇸 United StatesThe Sailing Stones of Racetrack Playa
The Story
For decades, scientists debated how heavy stones weighing up to 300 kilograms moved across the completely flat, dry mud surface of Death Valley's Racetrack Playa. The stones left behind deep, winding furrows, but nobody had ever filmed or witnessed the movement in person. In 2014, a dedicated scientific team using GPS-embedded rocks and time-lapse cameras finally captured the rare mechanism in action.
Images
Timeline
Geologists Thomas Clement and Sara Leeman publish the first formal scientific description of the stone tracks.
The Slideteras research team captures the first live, in-situ visual confirmation of rock movement via automated instruments.
A comprehensive peer-reviewed study is published in PLOS ONE detailing the mechanics of the ice-shove phenomenon.
Known Evidence
How well-documented and physically verified the case evidence is.
- Extensive physical furrows etched into the playa floor, with distinct parallel tracks proving multiple rocks moved simultaneously in identical directions.
- High-resolution GPS telemetry logs tracking rock velocities up to several meters per minute during specific winter weather window events.
- Time-lapse video footage capturing thousands of thin, floating ice panels fracturing and moving against the rocks under light wind pressures.
- Synchronized meteorological data proving rock displacement occurs exclusively when water depths on the playa measure between 5 and 10 millimeters.
Unresolved
What We Still Don't Know
- The exact frequency of the specific micro-climatic alignments required to generate the thin ice sheets without freezing the entire lake bed solid.
- Why certain large rocks remain completely stationary for multiple consecutive seasons while adjacent rocks of similar mass execute complex paths.
- The long-term erosion rates of the playa sediment caused by the recurring mechanical friction of the moving stone bases.
Hypotheses
Theories
Ranked by plausibility — highest first.
Ice-Shove Hydroplaning Mechanism
During rare winter rains, a thin sheet of water freezes over the playa at night, forming large panes of floating 'windowpane' ice. High morning winds push these fragile sheets against the rocks, driving them across the slick, muddy subsoil.
High-Velocity Katabatic Wind Gusts
The movement is driven directly by intense, localized desert windstorms. Rain saturates the clay floor, reducing friction to near-zero, allowing high-velocity gale-force winds to slide the heavy stones across the slick mud.
Nearby on the map