Left (L2/L5/L7):
Right ( R1/R2):
So Jon, you think this, er, gully, is entirely the work of wind and gravity? If not just these two forces, then what other processes contribute?
I am very much a visual oriented entity -- do you have some Earth images of such "gullies" that are not water related in any way?
I am especially intrigued by the precise pooling of the dark dust in the depressed -- or should that be recessed? -- areas.
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