You will notice that the soil is very sandy, with little silt and clay mixed in. In certain areas there is also little variation in grain size-very much like you would find in a sand dune along the ocean. Sand dunes often form at the front of a glacier. The glaciers that visited here were continental sized masses of ice. The air above the ice to the north was much colder then the air above the ground in front of the glacier.
Cold air is heavier then warm air.
The heavier sand particles would not be carried as far as silt and dust-sized particles. Instead the sand would tend to skip along the ground, sandblasting, polishing and eroding the surfaces of any rocks that they come in contact with. This sand might accumulates into dunes or dune fields scattered along the outer edge of the ice front. Dig into the substrate. That could indicate wind blown sand accumulated here.