posted on Oct, 4 2012 @ 05:59 AM
I'm thinking "sludge", a mixture of silicate and water. (think the sachets of "sprinkles"one often finds in packages, to keep moisture away)
It's the only way to prevent water/ice to sublimate immediately in the low pressure Martian athmosphere. It leaves the sludge fluid enough to make
some nice streams.
Oh, and that "half-moon"shape with the sharp edge? Quite normal in a place where the wind is mainly from one direction. Mauretania has some great
fields of crescent-shaped dunes. Sharp edges et all.
AFA Mars goes, I can imagine a dune with ice inside, wind blows on it, exposes the ice on only óne side, ice melts ,and the resulting water almost
immediately evaporates, but the ice stays "solid"on the lee/shadow side ,while the sand is blown over it, hence the "wave-roller shape"