44 
Relief map of the United States showing limits and theoreti- 
cal curvature of the ancient ice sheet at the stage of the Glacial 
Period following the main epoch. Modelled on a section of a 
globe I 6 V 2 feet in diameter. Scale, 1 inch equals 40 miles. 
Relief map of Missouri showing topographical and geological 
features and principal mining districts. 
Relief map of New Jersey showing topographical and geo- 
logical features. 
Model of Henry Mountains and vicinity, Utah, showing geo- 
logical formations and effects of erosion. 
Geological and relief map of the Henry Mountains showing 
effects of erosion. 
This is on a larger scale than the preceding map and shows 
only a portion of the same territory. 
Same as the above, ideally restored before erosion took 
place. 
Model showing Henry Mountains and vicinity ideally re- 
stored before erosion took place. 
1 his is on the same scale as the first of the series. 
The foregoing series of four maps illustrates the formation 
of laccoliths or dome-like mountains produced by the intrusion 
of lava. 
Relief map of Yellowstone National Park, showing Canons 
of the Yellowstone and Madison rivers, etc. Horizontal and 
vertical scale, 1 inch equals 1 mile, or 1: 63,360. 
Relief map of the Yosemite Valley from surveys made by 
Captain of Engineers, George M. Wheeler, U. S. A. Scale, 1 inch 
equals 1,000 feet. 
Relief map of Eureka District, Nevada, colored to show 
geological formations. Scale, 1 in. equals 1,600 feet. 
Relief map of the island of Porto Rico. Horizontal scale, 
1 inch equals 4 miles. Vertical scale, 1 inch equals 2 miles. 
Relief map of the Hawaiian Islands. Horizontal scale, 1 
inch equals 4 miles. Vertical scale, 1 inch equals 2 miles. 
Relief map of Niagara Falls and vicinity. Horizontal and 
vertical scale the same; 1 inch equals 500 feet. This map, be- 
sides exhibiting the familiar features of the Falls and Gorge, 
also makes plain the ancient shore of Lake Erie and the old 
channel leading from the Whirlpool. 
