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The hills in the image appear to be eroded, likely formed by sedimentary rock layers. Given that the location is Big Horn County, Montana, an area known for its badlands and semi-arid environment, these hills are likely part of a badlands landscape. This type of terrain is characterized by layers of soft sedimentary rock, such as clay, siltstone, and sandstone, which erode easily due to wind and water. The cracks and textures seen in the image are typical of this erosion process, where water causes expansion and contraction, leading to the cracked, dried surface.
Montana's geology, particularly in the badlands, often reveals layers from millions of years ago, potentially including fossils and mineral deposits. The elevation of 3,543 feet (1080 meters) also indicates this area is within the general elevation range for the region, adding to the possibility of these being part of the badlands terrain or other eroded sedimentary structures.