Check this out if you get a chance!
http://blogs.discovermagazine.com/badastronomy/2009/10/15/martian-swirly/
Amazing photo there of the result of Martian dust-devils.
http://blogs.discovermagazine.com/badastronomy/2009/10/15/martian-swirly/
Amazing photo there of the result of Martian dust-devils.