What exactly, can be classified as a "depositional environment"? Sediments CAN be deposited anywhere, pretty much, but many places they would not remain stationary long enough to harden.
Very fine sand or clay? Let's assume a spherical shape (or a cube, or whatever). The volume is calculated as length times width times height (dealing with the cube). The volume times the density gives us its mass. Now, we find the surface area on one half of the particle (only one half can be exposed to wind from one direction at any given time), which is guaranteed to be smaller. This measurement is in an approximate proportion to the ability of wind to apply a force to the particle. Now, let's say we cut this cube into eight equal parts, each with exactly half the dimensions of the original. The mass of each is now one-eighth the original mass, but the surface area is only one-fourth! Thus, we conclude that the smaller the particle, the more wind can act per milligram (or whatever unit of mass, etc.) of particle. More wind force = more blowing particles.
I remember from my days on the playground how the dust on the kickball fields would blow madly about with even the slightest breeze. The same wind force acting on the beach by my house would hardly budge a grain or two. Have you ever seen grains of sand floating around your house? Well, I've seen tiny little dust particles doing just that. If the sediments which formed the "tracks" were so small, they would have been quite literally "blown away" by the passage of the (relatively) gigantic spider. But if a stationary object made the "tracks", while being weighed down by water, the dust particles would not have been moved, but rather held in place by the object above.
I don't know about you, but it just doesn't make sense to me that wind has less power on dust than it has on sand.
Adios!
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"For God so loved the world that he gave His only begotten Son, that whosoever believeth in Him shall not perish, but have everlasting life."