Mushroom pedestal formations, South Unit. Theodore Roosevelt National Park, North Dakota, USA. http://www.terragalleria.com/parks/np-image.thro20721.html Big cannon ball formations in eroded badlands, North Unit. Theodore Roosevelt National Park, North Dakota, USA. http://www.terragalleria.com/parks/np-image.thro20706.html Erosion formations. Theodore Roosevelt National Park, North Dakota, USA. http://www.terragalleria.com/parks/np-image.thro20711.html Caprock formations, late afternoon, Petrified Forest Plateau. Theodore Roosevelt National Park, North Dakota, USA. http://www.terragalleria.com/parks/np-image.thro20717.html Storm cloud and badlands at sunset, South Unit. Theodore Roosevelt National Park, North Dakota, USA. http://www.terragalleria.com/parks/np-image.thro8680.html Little Missouri River Oxbow Bend in autumn, North Unit. 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