ROCKY MOUNTAIN STRUCTURE IN IDAHO 457 
B 
Fic. 7—A, View south along west flank of Waterloo Hill about 3 miles east of 
Montpelier, Idaho, showing drag folds accompanying large unsymmetrical anticline; 
B, view of same folds northward from different viewpoint, showing west flank of the 
same anticline. Cw, Wells formation, Pennsylvanian; Cpa, phosphatic shale member 
of Phosphoria formation, Permian; Cpb Rex chert member of the Phosphoria forma- 
tion, Permian; Trw, Woodside shale, Lower Triassic. 
