IRON MOUNTAIN. Iron Mountain is seven miles northwest of Marathon in northern Brewster County (at 30°18' N, 103°16' W). Its summit, at an elevation of 5,413 feet above sea level, rises 900 feet above the Iron Mountain Ranch at its northeastern base. Iron Mountain is a dark-colored peak of intrusive rock from the Tertiary period, between 2 and 66 million years old, which stands out among the surrounding light-gray sedimentary rocks. The local soils are shallow and stony and support scrub brush and grasses.
The following, adapted from the Chicago Manual of Style, 15th edition, is the preferred citation for this article."IRON MOUNTAIN," Handbook of Texas Online (http://www.tshaonline.org/handbook/online/articles/rji12), accessed December 09, 2013. Published by the Texas State Historical Association.