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For many years iron ore has been known to exist in central Wyoming. As early as 1870 the paint-rock deposits near Rawlins were opened, and in the early eighties only the isolation of the Seminoe deposits prevented their exploitation. Although the deposits have been known for nearly 60 years the available information about them is extremely meager, and owing to the demand for a detailed report on this region a survey of the Seminoe iron-ore deposits, the Rawlins paint-rock ores, and the Shirley iron-bearing veins was made by the writer in June, 1926. The Union Pacific Eailroad Co. and the Colorado Fuel & Iron Co. courteously permitted the writer to examine their private reports on the iron districts described in this paper. The help extended by the officials of both companies is deeply appreciated, and this opportunity is taken to thank Messrs. J. M. Shively, the land commissioner of the Union Pacific Railroad Co., and L. B. Weed, the superintendent of mines of the Colorado Fuel & Iron Co., for their courtesy and aid. The field work was greatly expedited through the efforts of the Rawlins Chamber of Commerce, and the writer is glad to acknowledge the assistance rendered by the members of this organization. The hospitality of Mr. Matt Brantley and his first-hand knowledge of the development of the Seminoe region were of great value.

Contributions to economic geology (short papers and preliminary reports), 1929, Part I, Metals and nonmetals except fuels. The Rawlins, Shirley, and Seminoe iron-ore deposits, Carbon County, Wyoming