12 IRON ORES OF IRON SPRINGS DISTRICT, UTAH. 
would follow in a short time; accordingly, detailed geological work 
was begun in this district in 1905 by Mr. Leith, with E. C. Harder and 
Frank J. Katz as field assistants, and was continued during the early 
part of the held season of 1906 by E. C. Harder and Freeman Ward, 
the senior author being with the party for three weeks. The results 
of this work are presented in the following pages. It is believed 
that they will be found to apply in their essential features to many 
other deposits of the same general class in western United States. 
PREVIOUS WORK. 
Lying near the northwest side of the High Plateau region and in 
the southeast part of the Basin Range province, the Iron Springs 
district has received passing attention from Powell (1875 and 1879), a 
and Dutton (1880 and 1882) b and associates in their general surveys 
of the High Plateaus and Colorado River, and from the geologists of 
the Wheeler Survey — Howell (1875), c Gilbert (1875), d and Marvine 
(1875)/ Their maps and descriptions are necessarily so generalized 
that they are of little value in detailed study of the district under dis- 
cussion. They are important, however, in establishing a basis for the 
general correlation of formations. 
The Powell Survey prepared a reconnaissance topographic map of 
southern Utah, part of which, covering the Iron Springs district, is 
included in the St. George sheet of the United States Geological 
Survey. While this is too much generalized to be of use in detailed 
mapping, it expresses the general topographic and geographic rela- 
tions of the Iron Springs district to the surrounding territory. 
Howell (1875X was the first of the early geologists to make anything 
like a specific description of the Iron Springs district and its iron-ore 
deposits. He includes analyses of the ores by C. E. Dutton. 
In 1880 the deposits received attention from J. S. Newberry ,^ then 
America's leading authority on iron ore. He describes the deposits as 
constituting "perhaps the most remarkable deposit of iron ore yet 
developed on this continent," and refers the sediments of the district 
a Powell, J. W., Exploration of the Colorado River of the West and its tributaries; explored in 1869, 
1870, 1871, and 1872, under the direction of the Secretary of the Interior; U. S. Geog. and Geol. Surv. 
Rocky Mountain Region, Washington, 1875, 291 pp.; Report on the lands of the arid region of the 
United States, with a more detailed account of the lands of Utah; U. S. Geog. and Geol. Surv. Rocky • 
Mountain Region (2d ed.), 1879, 195 pp. 
b Dutton, C E., Report on the geology of the High Plateaus of Utah; U. S. Geog. and Geol. Surv. 
Rocky Mt. Region, 1880, 307 pp.; Tertiary history of the Grand Canyon district; Mon. U. S. Geol. Sur- 
vey, vol. 2, 1882, 264 pp. 
c Howell, E. E., Report on the geology of portions of Utah, Nevada, Arizona, and New Mexico, exam- 
ined in the years 1872 and 1873; U. S. Geog. Surv. W. 100th Mer., vol. 3, Geology, 1875, pt. 3, pp. 227-301. 
d Gilbert, G. K., Report on the geology of portions of Nevada, Utah, California, and Arizona exam- 
ined in the years 1871 and 1872; U. S. Geog. Surv. W. 100th Mer., vol. 3, Geology, pt. 1, 1875, pp. 17-187. 
< Marvine, A. R., Report on the geology of route from St. George, Utah, to Gila River, Arizona, 
examined in 1871; U. S. Geog. Surv. W. 100th Mer., vol. 3 Geology, pt. 2, 1875, pp. 189-225. 
/ Op. cit., pp. 261-263. 
9 Newberry, J. S., The genesis of the ores of iron: School of Mines Quart., Nov., 1880, pp. 9-12. 
