THURSTON CANYON. Thurston Canyon, a valley traversed by an intermittent stream, begins in south central Terrell County a mile northeast of Dryden (at 30°03' N, 102°03' W) and runs southeast for twenty miles to meet Meyers Canyon (at 29°59' N, 101°52' W); the confluence forms Lozier Canyon, which is one mile north of Malvado in southeastern Terrell County. Three tributaries join Thurston Canyon. Buck Creek joins it four miles east of State Highway 349, and Prairie Creek and Prairie Canyon enter it less than one-half mile apart, three miles north of U.S. Highway 90. Thurston Canyon sharply dissects massive limestone in flat terrain, crosses hard limestone and limy mud on variable surfaces, and traverses alluvial fans of sand, gravel, and mud on steep to gentle slopes. Soils in the area are generally dark, calcareous stony clays and clay loams. The vegetation consists primarily of scrub brush, oaks, junipers, grasses, and mesquites. Thurston Canyon was named for a nearby railroad stop, which was named for Roadmaster Thurston of the Galveston, Harrisburg and San Antonio Railway.