NORTH DAKOTA STATE UNIVERSITY - FARGO, N D
The ridges in the previous photo were a consequence of differential compression of soils subjected to creep. This "rippled" form can also be reflected in man-emplaced structures.
In this photo taken from under an I-94 overpass at Fargo, concrete pads have shifted down-slope on soils affected by creep. The upward squeezing of the pads, shown here, is similar in origin to the ridges of the previous photo: both are induced by differential down-slope flow velocities of soil and "rock" materials.