TWIN MOUNTAINS (JEFF DAVIS AND PRESIDIO COUNTIES)
TWIN MOUNTAINS (Jeff Davis and Presidio counties). The Twin Mountains (or Twin Sisters) are one-half mile east of Franks Canyon in southern Jeff Davis and northeastern Presidio counties (at 30°25' N, 103°50' W). At an elevation of 6,895 feet above sea level, the northeastern peak in Jeff Davis County rises 1,250 feet above the grassland of the surrounding area. The southwestern peak in Presidio County has an elevation of 6,670 feet above sea level. The mountains, composed of metamorphic and intrusive igneous deposits, stand in desert mountain terrain of gentle to steep slopes and rugged canyon land. Vegetation consists primarily of sparse grasses, cacti, and desert shrubs of conifers and oaks. According to local myth, the notched peaks were called Twin Sisters for twin Indian girls who fell in love with the same young man. They fought jealously over him until the Great Spirit turned them into the double-peaked mountain to teach them a lesson.