If the atmosphere is the same...
It isn't. Fluid flow in and around terrain is largely chaotic, especially at the scale where the fluid is a planetary atmosphere and the terrain features in question are only tens of meters in size. Comparing examples of entrained-particle deposition in that regime is as useless an exercise as can be undertaken. Your attempt to falsify the dust hypothesis by reference to another example is clearly outside the realm of fluid dynamics. It's not too strong to say that your premise on this point is pure delusion.
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