Death Valley's Sailing Stones
Rock trails on the Racetrack Playa. Source: Figure 2, Sliding Rocks on Racetrack Playa, Death Valley National Park: First Observation of Rocks in Motion. doi:10.1371/journal.pone.0105948.g002

Rock trails on the Racetrack Playa.
Source: Figure 2, Sliding Rocks on Racetrack Playa, Death Valley National Park: First Observation of Rocks in Motion. doi:10.1371/journal.pone.0105948.g002