Inscription: Inscribed in the negative: "87"; printed on mount, upper edge: "WAR DEPARTMENT [+ insignia]// Explorations in Nevada and Arizona. Expedition of 1871. Lieut. Geo. M. Wheeler, Com'd'g."; lower edge: "T. H. O'Sullivan, Phot.// GEOLOGICAL SERIES// CASTELLATED SAND-BLUFFS, FORTIFICATION ROCK// No. 87".