Taken from Lethbridge: A Centennial History p.15.
The development of hoodoos is an effect of aeolian action.  This picture was taken in 1984 of the Oldman River Valley near Whoop-Up Drive and above Fort Whoop-Up.  It shows the laundry hill megablock (one of the geological layers) as well as the aforementioned hoodoos.  The wind action is occurring at the end of the coulee rather than at the base of it, which would nullify the aeolian theory.

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