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Rocks That Leave Tracks

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Probably many of you are aware of a playa in California that has moving rocks that leave tracks in the mud, maybe they are blown about by wind:


I'm intrigued to see what looks like similar formations at a much larger scale on Google Mars at 4.554 N 152.582 E.  Does anybody have an idea how these landforms might have been created?

Steve Richardson
2i3D Stereo Imaging

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Interesting and intriguing. I knew about the rocks here in Calif., but I hadn't heard of those ones on Mars before. Maybe a similar mechanism at play? I wonder, would it require a thin coating of ice or mud or are the lighter gravity (and stronger winds?) on Mars enough to make it work on sand or whatever the surface material is in that area (in conjunction with just enough of a slope?)?

Dave Barnes
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Could they be meteor impact tracks for some reason? Are those dark specks necessary rocks?

Hugo Ahlenius
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