114 



PHYSIOGRAPHY 



Fig. 115. The face of the Palisade Ridge, west of the lower Hudson. The 

 rock is jointed, as shown by the vertical lines on the cliff face. Ice mov- 

 ing over this from left to right would break off large quantities of rock. 



Fig. 116. A mountain valley cleared of all earth and loose rock by a glacier 

 which once passed through it. The moving ice also smoothed all the 



E rejecting points of rock. A type of a glaciated mountain valley in the 

 igher part of the Needle Mountains, Colorado. 



