BARRILLA MOUNTAIN. Barrilla Mountain, a summit in the Barrilla range also known as Flat Top Mountain, is in the southeastern corner of Reeves County (at 30°47' N, 103°37' W). With an elevation of 4,672 feet above sea level, Barrilla Mountain is the highest peak in Reeves County and rises 555 feet above the adjacent canyonland. The surrounding flat terrain and rugged canyonland of desert mountain volcanic rock is surfaced by wash deposits of sand, gravel, and mud that support live oak, piñon, juniper, grasses, maple, ponderosa pine, madrone, and water-tolerant hardwoods and conifers. Prehistoric people lived in rock shelters around the edge of the Barrilla Mountains and left behind pictographs. The mountain and the range were named for the salt cedars that grow in the Trans-Pecos region.
Alton Hughes, Pecos: A History of the Pioneer West (Seagraves, Texas: Pioneer, 1978).