# The sailing stones of Racetrack Playa move by a supernatural or magnetic force that carves their trails across the dry lakebed

**Verdict: Contradicted.** The movement of the stones is real and long documented: rocks on the Racetrack Playa in Death Valley leave long trails across the mud, and for decades no one had seen them do it. The rated claim is different: that the motion is driven by magnetism, some paranormal or supernatural force, or otherwise defies natural explanation. That claim is debunked. In the winter of 2013 to 2014 a research team using GPS-instrumented rocks, a weather station, and time-lapse cameras recorded the stones in motion for the first time and published the mechanism in PLOS ONE in 2014: a thin shelf of overnight ice breaks up in the late-morning sun and, pushed by a light wind, the floating panels shove the rocks along the slick mud. No magnetism and nothing supernatural is involved. The dolomite and syenite rocks are not even magnetic. What remains genuinely interesting is how rarely the exact conditions align, which is why the movement stayed unseen so long.

Category: Unexplained Phenomena · Era: Mid-20th century to 2014 · First circulated: The trails were noted by prospectors and early visitors in the first half of the 20th century; magnetic, paranormal, and other exotic explanations spread through popular culture, roadside lore, and later the internet as the site drew tourists · Believed by: Casual visitors and paranormal enthusiasts drawn by a genuine, long-unsolved mystery; magnetic and supernatural versions circulated in popular articles, television segments, and New Age travel lore rather than among geologists, who favored wind and ice from early on
URL: https://theconspiratory.com/theory/racetrack-playa-sailing-stones

## Summary
On the floor of Racetrack Playa, a dry lakebed in a remote corner of Death Valley National Park, hundreds of rocks sit at the end of long, meandering furrows they appear to have plowed across the mud themselves. Some trails run more than a thousand feet. No one had ever seen a stone move, and the rocks can sit motionless for years, so the site became a magnet for explanations ranging from strong wind and ice to magnetism, alien intervention, and the supernatural. Keep two things apart: real rocks that really do move, and leave real trails; and the claim this file rates, that the cause is magnetic or paranormal. The mechanism was directly observed and measured in the winter of 2013 to 2014 and published in 2014: thin sheets of overnight ice, breaking up in light wind, push the stones across a slick, saturated surface. On the supernatural and magnetic claim, the verdict is debunked. The lingering wonder, why the phenomenon is so rare and so hard to catch, is treated as the honest open detail it is.

## The claim
That the sailing stones of Racetrack Playa are moved by an unexplained force, most often described as magnetism emanating from the ground or the surrounding mountains, or as a paranormal, supernatural, or otherwise anomalous cause that ordinary physics cannot account for.

## Origin and timeline
- 1915: A prospector, Joseph Crook, is among the early visitors to note the curious rock trails on the playa. Over the following decades the tracks become a local curiosity, with no one able to say how rocks weighing up to hundreds of pounds could plow furrows across a flat, dry lakebed.
- 1948: Geologists Jim McAllister and Allen Agnew map the area and publish the first scientific report on the sliding rocks, suggesting that strong winds acting on a wet, slick surface could push the stones. The account brings the phenomenon to a wider audience.
- 1955: Geologist George M. Stanley publishes “Origin of Playa Stone Tracks” in the Geological Society of America Bulletin. Judging the rocks too heavy for wind alone, he proposes that sheets of ice forming around the stones help drag or sail them. His work explicitly sets natural processes against pseudoscientific ideas such as magnetism.
- 1972: Bob Sharp and Dwight Carey begin a multi-year monitoring program, labeling individual rocks and staking a “corral” of posts around several to test the ice hypothesis. Over seven winters they track movements but never witness one, and read their results as favoring wind on wet mud over ice.
- 1990s: With growing tourism and media coverage, exotic explanations spread in popular culture: magnetic fields drawn from the mountains, dust devils, alien or paranormal intervention. Geologists continue to point to wind, water, and ice, but the mystery, and its supernatural retellings, become part of the site's draw.
- 2011: Planetary scientist Ralph Lorenz and colleagues propose a refined ice mechanism, likening a rock ringed by buoyant ice to an ice cube floating in a tray of water, needing only a gentle breeze to move. They begin planning a field study to catch the process directly.
- 2013-2014: A team including Richard Norris, James Norris, and Ralph Lorenz instruments 15 rocks with GPS units and installs a weather station and time-lapse cameras. On 20 December 2013 they witness and record more than 60 rocks sliding at once, driven by wind-pushed ice panels. Some instrumented rocks travel up to 224 meters over the season.
- 2014-08-27: The team publishes “Sliding Rocks on Racetrack Playa, Death Valley National Park: First Observation of Rocks in Motion” in PLOS ONE, documenting the mechanism in detail. The National Park Service and Scripps Institution of Oceanography announce that the long-standing mystery is solved.

## The evidence, claim by claim
- Claim: The stones are pulled by magnetism from the ground or the surrounding mountains.
  Evidence: Magnetism does not move ordinary rocks, and these are ordinary rocks. The sailing stones are pieces of dolomite and syenite eroded from the cliffs and peaks around the playa; neither is a magnet, and no measured magnetic field at the site could drag a stone across mud. Magnetism also cannot explain trails that curve, zigzag, run parallel, or reverse direction, which the observed wind-and-ice mechanism produces naturally. The magnetic story survives on the word alone, not on any physics.
- Claim: No one has ever seen the rocks move, so the cause must be something beyond natural explanation.
  Evidence: That was true for decades, and it is no longer true. In December 2013 the research team directly observed and filmed more than 60 rocks moving at once, with GPS units recording the tracks and a weather station recording the wind. The movement was not unseen because it was supernatural; it was unseen because it is rare, brief, happens in a remote and often inaccessible spot in winter, and occurs at a slow 2 to 5 meters per minute that is easy to miss even when present.
- Claim: The rocks are far too heavy for a light wind to push, so the ordinary explanation fails.
  Evidence: The wind does not push the rock directly; it pushes rafts of ice that in turn shove the rock across a lubricated surface. After winter rain pools and freezes overnight, a windowpane ice sheet only 3 to 6 millimeters thick forms. As it melts and cracks in the morning sun, panels tens of meters across, driven by winds of only about 4 to 5 meters per second, press against the stones. Floating ice against slick, saturated mud reduces the needed force dramatically, which is why even heavy rocks glide.
- Claim: Earlier scientists ruled out ice, showing the mainstream had no real answer.
  Evidence: Sharp and Carey doubted a specific version of the ice idea, in which a large rigid ice collar grips a rock, but they did not rule out ice altogether, and science did not stop with them. The 2014 study identified a different ice process: thin, mobile floating panels rather than a thick locked sheet. Revising a hypothesis with better observation is how the field progressed, not evidence that a natural cause was missing.
- Claim: The strange, tidy trails look designed or guided rather than random.
  Evidence: The trails look exactly as a wind-and-ice mechanism predicts. Rocks pushed by drifting ice panels and steered by gusts produce long, gently curving, sometimes parallel and sometimes crossing tracks, occasionally with sharp bends where the wind shifts. The recorded events matched these patterns directly. Reading intention into wind-carved furrows is the same pattern-seeking that finds faces in clouds.

## Why people believe it
- The mystery was real and unusually durable. For most of a century the rocks genuinely had never been seen moving, and a real unsolved puzzle in a stark, otherworldly landscape is fertile ground for extraordinary explanations.
- The setting is dramatic. A flat, cracked lakebed ringed by mountains, littered with stones trailing furrows behind them, looks staged, and a scene that looks designed invites the thought that something designed it.
- The motion is invisible in practice. Because the movement is rare, slow, and happens in a remote place in winter, visitors only ever see the aftermath, which makes an ordinary cause feel inadequate to the eerie result.
- Magnetism sounds scientific without being checkable by a tourist. It is a real force people vaguely associate with mysterious attraction, so invoking it feels like an explanation while asking nothing of the person offering it.
- Popular media rewarded the wonder. Television segments, roadside lore, and later viral posts leaned into aliens, magnetism, and the paranormal because mystery travels further than a careful account of wind, water, and ice.

## Open questions
- Exactly how often the full sequence of rain, overnight freeze, a thin melting ice sheet, and the right light wind lines up is still not precisely known, which is much of why the movement stayed unrecorded for so long.
- Whether every trail on the playa, including older ones formed before instruments were present, was made by the same thin-ice-panel process or whether other minor variants also contribute over long spans remains a reasonable geological question.
- How a warming climate, with fewer hard overnight freezes on the playa, may change or end the phenomenon over coming decades is an open scientific matter, separate from the settled question of the mechanism.

## Sources
- Sliding Rocks on Racetrack Playa, Death Valley National Park: First Observation of Rocks in Motion, PLOS ONE (2014): https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0105948
- Mystery Solved: Sailing Stones of Death Valley Seen in Action for the First Time, Scripps Institution of Oceanography (2014): https://scripps.ucsd.edu/news/mystery-solved-sailing-stones-death-valley-seen-action-first-time
- Mystery Solved: Mysterious sailing stones of Death Valley seen in action for the first time, National Park Service, Death Valley National Park (2014): https://www.nps.gov/deva/learn/news/racetrack.htm
- The Racetrack, National Park Service, Death Valley National Park (2024): https://www.nps.gov/deva/planyourvisit/the-racetrack.htm
- Death Valley's sailing stones caught on the move, Science News (2014): https://www.sciencenews.org/article/death-valleys-sailing-stones-caught-move
- Scientists solve mystery of Death Valley's 'sailing' stones, The Christian Science Monitor (2014): https://www.csmonitor.com/Science/2014/0827/Scientists-solve-mystery-of-Death-Valley-s-sailing-stones
- Racetrack Playa: The home of Death Valley's mysterious 'sailing stones', Live Science (2023): https://www.livescience.com/planet-earth/geology/racetrack-playa-the-home-of-death-valley-s-mysterious-sailing-stones
- The Mystery of Death Valley's Sailing Stones Solved (...again), Scientific American (2014): https://www.scientificamerican.com/blog/history-of-geology/the-mystery-of-death-valleys-sailing-stones-solved-again/
- Sailing stones, Wikipedia (2024): https://en.wikipedia.org/wiki/Sailing_stones

Rated by The Conspiratory, a neutral, sourced encyclopedia of conspiracy theories. Full page: https://theconspiratory.com/theory/racetrack-playa-sailing-stones