It's a good theory, and not the first time that ice has been proposed as playing the major role at the Racetrack Playa. I have a friend who is obsessed with ta

It's a good theory, and not the first time that ice has been proposed as playing the major role at the Racetrack Playa. I have a friend who is obsessed with taking photographs of these, and it was about five years ago that I first heard the ice theory (and about these wacky furrows in the Playa) - I'm sure people have had ideas like this for even longer. I think it's a stretch to say that this has been "Figured Out" - I'll give that credit to the first person who records an observation of them moving. Until then - just more theories. [Edit - I like this 10+ year old theory, which suggests it's actually a case of moving ice sheets, with rocks embedded in them, that actually causes the furrows. http://skeptoid.com/episodes/4021 http://skeptoid.com/episodes/4021]