The San Luis Hills[2] are a group of small mountain ranges in Conejos and Costilla counties in the San Luis Valley in southern Colorado.[4] The individual mountain ranges that make up the San Luis Hills include the Fairy Hills, the Brownie Hills, the Piñon Hills, and the South Piñon Hills. The San Luis Hills' highest point is Flat Top, elevation 9,206 feet (2,806 meters).[1]
^Burroughs, Richard L. (1971). "Geology of the San Luis Hills, south-central Colorado". In James, H.L. (ed.). San Luis Basin (Colorado): New Mexico Geological Society 22nd Annual Fall Field Conference Guidebook. New Mexico Geological Society. pp. 277–287.
^Thompson, Ren A.; Shroba, Ralph A.; Machette, Michael N.; Fridrich, Christopher J.; Brandt, Theodore R.; Cosca, Michael A. (2015). Geologic map of the Alamosa 30′ × 60′ quadrangle, South-Central Colorado(PDF) (Map). Scientific investigations map ; 3342. Reston, VA: U.S. Department of the Interior, U.S. Geological Survey. p. 2. Retrieved 2020-12-31.