48 



PHYSIOGRAPHY 



Fig. 35 Curious forms of weathered 

 rock. A harder layer of rock at 

 the top spans an opening weath- 

 ered out of weaker rock below. 

 Goblin's Archway, Last Chance 

 Creek, Utah. (From photo, by 

 Killers, U. S. Geol. Surv.) 



Fig. 36. Stand Rock; a pillar of 

 rock separated from the upland to 

 the left by the widening of a crack. 

 Dells of the Wisconsin. 



REFERENCES 



1 SHALER, Chapter on Caverns, in Aspects of the Earth: Scribner's Sons. 



2. GEIKIE, Earth Sculpture, Chapter XIII: Putnam. 



3. SALISBURY, Physiography, Advanced Course, chapter III: Henry Holt 

 &Co. 



4. Standard text-books on Geology. 



