PLATE X. — View of the " corry " iu Section 7, showing an example of gorge 

 cutting in an early stage. The backward cutting of the falls prodiices the gorge, 

 and the downward cutting of the stream the V-shaped trench seen above. The 

 Encrinal limestone is seen near the middle of the cliff. 



— Photographed by A. W. Grabau. 



