312 



STRUCTURAL GEOLOGY OF NORTH AMERICA 



5 6 7 



ELK CREEK SECTION 



Faults 



Horizontal and Vertical Scales 



Fig. 20.8. Geologic sections along Elk Creek and Cardinal River in the southern part of the Cardinal 

 district. After Hake et a/., 1942. See map. Fig. 20.9. 



between the reverse faults are generally overturned toward the east and, 

 in harmony with the faults, represent eastward movement of the thrust 

 sheets. 



In Montana, much of the foothill belt is covered with glacial drift, and 



the structures there, especially just south of the border, are not well 

 known. See section F-F', Fig. 20.7. Farther south, folding and overturn- 

 ing to the east seems to dominate reverse faulting (sections H-H' and 

 J-J' Fig. 20.7). 



