OVERTHRUST FAULT IN NEARLY FLAT STRATA 535 
zone may be seen in the photograph to extend to the left (westward) 
from near the position of the hammer. It dips 29 degrees east 
between the ends of the dislocated coal bed but flattens to the west. 
Fic. 1.—Overthrust fault cutting coal bed, sec. 3, T. 2 N., R. 35 E., P.M. 
Montana. 
Fic. 2.—Nearer view of fault shown in Fig. 1 
The peculiar shape in which the coal bed has been thrown also 
seems to indicate that the fault zone is not a plane but is curved 
near the place where it cuts the coal bed. The inclosing strata are 
