ROCKY MOUNTAIN STRUCTURE IN IDAHO 445 
The area included in the detailed surveys is nearly 3,000 square 
miles comprised in the Fort Hall Indian Reservation, and in the 
Montpelier, Slug Creek, Crow Creek, Lanes Creek, Freedom, 
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Fic. 1.—Index map of southeastern Idaho: A, Fort Hall Indian Reservation; ~ 
B-H, seven quadrangles; B, Cranes Flat; C, Henry; D, Lanes Creek; E, Freedom; 
F, Slug Creek; G, Crow Creek; H, Montpelier. The areas lettered 2-10 are those 
illustrated by the corresponding figures. 
Henry, and Cranes Flat quadrangles, all of which are fifteen- 
minute quadrangles except the Montpelier, which is a thirty- 
minute quadrangle. The location of these areas is shown on the 
accompanying map, Figure 1. 
