SAN ANTONIO MOUNTAIN
SAN ANTONIO MOUNTAIN. San Antonio Mountain is on the Texas-New Mexico border twenty miles northwest of Dell City in north central Hudspeth County (at 32°00' N, 105°33' W). Its summit reaches 7,023 feet above sea level. It is the westernmost, largest, and highest of the Cornudas Mountains. San Antonio Mountain is a laccolith, or mushroom-shaped igneous intrusion, from the Cretaceous period, some 100 million years ago. On it, shallow, stony soils support scrub brush and grasses.