Ah-Shi-Sle-Pah Wilderness is located in San Juan County, New Mexico, between Chaco Canyon and the De-Na-Zin Wilderness. The wilderness has multicolored badlands, sandstone hoodoos, petrified wood and dinosaur bones, similar to those found in the nearby Bisti Badlands and De-Na-Zin Wilderness.
The BLM Wilderness Study Area (WSA) was declared in May 1992 and would protect an area of about 26.5 km2 (6,563 acres). The area was prospected by the dinosaur hunter Charles Hazelius Sternberg in the summer of 1921. Sternberg collected the type specimen of Pentaceratops fenestratus, a ceratopsid dinosaur from the late Cretaceous Period, within the WSA. Specimens from this area form a significant part of the vertebrate paleontology collection at the Museum of Evolution, University of Uppsala, Sweden. Fossil collecting here without a permit is prohibited by law.
The John D. Dingell, Jr. Conservation, Management, and Recreation Act, signed March 12, 2019, authorizes the establishment of the Ah-Shi-Sle-Pah Wilderness as a component of the National Wilderness Preservation System, protecting approximately 7,242 acres.
Rock units within the Ah-Shi-Sle-Pah WSA include most of the upper Fruitland Formation (Fossil Forest Member) and lower part of the Kirtland Formation (Hunter Wash Member), both late Cretaceous in age. The rocks are dominated by mudstones and intermittent sandstones, with occasional resistant channel sandstones.
- Bisti/De-Na-Zin Wilderness
- Kasha-Katuwe Tent Rocks National Monument
- Demoiselles Coiffées de Pontis
- Đavolja Varoš
- Ah-shi-sle-pah Wilderness Study Area by Isabel Synnatschke
- Sullivan, R.M. 2006. Ah-shi-sle-pah Wilderness Study Area (San Juan Basin, New Mexico): A paleontological (and historical) treasure and resource. New Mexico Museum of Natural History and Science Bulletin 34:169-174. PDF Archived July 15, 2011, at the Wayback Machine
- "John D. Dingell, Jr. Conservation, Management, and Recreation Act (S.47)" (PDF). Congress.gov. Retrieved 16 March 2019.
- Ah-shi-sle-pah WSA Bureau of Land Management
- Ah Shi Sle Pah Wash, Hoodoo king of the San Juan Basin badlands at Inside Outside Southwest magazine
- Ah-Shi-Sle-Pah gallery by photographer John Fowler
- Ah-Shi-Sle-Pah WSA at Wikimapia
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