HORSESHOE MESA. Horseshoe Mesa is thirty-one miles southeast of Marathon in east central Brewster County (at 29°52' N, 102°49' W). Its summit, at an elevation of 4,060 feet above sea level, rises 1,260 feet above Dove Mountain Road, 3½ miles south. Soils on the mesa are shallow and stony and support oak, juniper, and some mesquite. The mesa was most probably named because its shape roughly resembles a horseshoe, opening to the west.