22 G. K. Gilbert—The Colorado Platzau Province. 
It is evident that if two monoclinal folds are combined back — 
to back, the result will be an anticlinal; if they are joined foot 
to foot, they will form a synclinal. Hence the monoclinal fold 
level to the lower; and that at another point they are broken 
across, and the dissevered edges have slidden past each other. 
2. 
tum had been fractured, 
iain Tea 
while another, less rigid, 
or coerced perhaps by a 
23 
: & 
incumbent rock, had been only flexed. A third mode of com- 
representation of two blocks of strata, 4 and B, cut out from 
their surroundings, so as to exhibit the manner of their relative 
Se cenenh The front of the segment shows a flexed bed 
erlying a faulted one. The top of the segment shows a fault 
at the front, a monoclinal fold at the back, and a compound 
displacement midway. 
he monoclinal fold is not unknown in other parts of the 
