LACCOLITHIC GENESIS 
205 
permits the escape of the water; and if the ice be covered with 
snow the water insinuates itself between the layers of ice and 
snow. 
Fig. 13. lyateral Displacement of Dike. 
With Cross, in the case of the West Elk Mountains of Colorado, 
and Iddings, in the instance of the Holmes Mountain of Mon¬ 
tana, the possible presence of faults was a theoretical conse¬ 
quence. Concerning the Sierra del Oro the actual situation of 
laccoliths along fault-lines was a matter of direct observation 
