The Lime Peak pluton is one of five lower Tertiary and/or Upper Cretaceous plutons exposed in the White Mountains (Foster and others, 1983). The Lime Peak pluton is a composite intrusion comprising at least three plutonic phases cut by two sets of north-trending dikes (Burton and others, 1985). The most abundant rock type is medium- to coarse-grained, equigranular to porphyritic, biotite granite that contains approximately 35 percent smoky quartz, 40 percent orthoclase, 20 percent albitic plagioclase, 5 percent biotite and trace to minor amounts of fluorite, apatite and zircon. Plagioclase, quartz and biotite occur as subhedral, embayed crystals surrounded by larger anhedral orthoclase phenocrysts. This unit commonly forms tors that line ridgetops in the Lime Peak area. The second most abundant intrusive phase is leucocratic, fine-grained, hypidiomorphic granular, seriate biotite granite that is found along the margins of, and in scattered outcrops within, the Lime Peak pluton. The third unit is a small body of moderately coarse-grained equigranular muscovite granite composed of approximately 40 percent smoky quartz, 30 percent albitic plagioclase, 25 percent orthoclase, 4 percent muscovite, up to 2 percent tourmaline, and minor amounts of fluorite. This third unit outcrops at the southwestern end of the Lime Peak pluton. The Lime Peak pluton intrudes metasedimentary rocks, dominantly quartzite and argillite, of Precambrian and/or Paleozoic age (Burton and others, 1985). Wilson and Shew (1981) obtained a K-Ar age of 56.7 m.a. for the granite, which intrudes sandstone, shale, and slate. The intrusion is exposed over 2500 vertical ft, and forms abundant rubble above 3500 ft elevation.