One of the best places in Colorado to view these significant geologic features is Trail Ridge Road in Rocky Mountain National Park (40.41653 N,-105.74619 W) near Iceberg Pass. Notice how in the aerial view below that the sackungen are concentrated in the vicinity of Iceberg Pass but not so noticeable as one moves along Trail Ridge away from there.  That is probably because the ice in the cirque on the north side of the pass was eating back toward the ice of the glacier in Forest Canyon.  Therefore, when the ice was no longer there to support the narrow ridge, the body forces within the ridge caused it to begin spreading.

 
Photo:  V. Matthews

Sackungen are easy to view in the Alpine tundra of Colorado's highest continuous highway - perhaps even easier when you fly over in an airplane!
 
Photo:  V. Matthews                                            Aerial image showing parallel sackungen

 Colorado Geological Survey