Theodore Roosevelt National Memorial Park, North Dakota. Rotated slump blocks in a huge landslide in the north unit of the park. The layering of the Fort Union Formation in the cliffs on the skyline, where the landslide originated, is horizontal. Figure 21, U.S. Geological Survey Bulletin 1493; Figure 14 (black and white), U.S. Geological Survey Circular 798. Circular-0798

Digital File:tdeb0012

ID. Trimble, D.E. 12cp