6 ILLUSTRATIONS. 
Page. 
Plate XIX. A, War Eagle iron-ore deposit, north of Iron Springs; B, Iron-ore 
contact deposit at Desert Mound 70 
XX. Plat of ore composition 72 
XXI. A, Contact phase of the Pinto sandstone west of Iron Mountain; 
B, Reticulated iron-ore veins in andesite 74 
Fig. 1. Sketch map of parts of Utah, Arizona, and Nevada, showing geographic 
relation of Iron Springs district to physiographic regions 15 
2. Geologic column of the Iron Springs district 17 
3. Plat of faults and iron-ore veins in the Iron Springs district 19 
4. Cross section of Desert Mound contact deposit 68 
5. Cross section of Great Western fissure veins 68 
6. Cross section of Lindsay Hill contact deposit 68 
7. Cross section of Blowout contact deposit 69 
8. Cross section southeastward through Lindsay Hill, showing structural 
relations of ores 69 
9. Ideal cross section through Iron Mountain laccolith, showing structural 
relations of ores 69 
10. Vein of magnetite in andesite 71 
11. Sketch map of Bull Valley district 90 
