THE PHYSICS OF THE EARTH. 



205 



§ 25. The Origin of Faults in the Earth's Crust. — It has long 

 been recognized that faults in the earth's crust are often displaced 

 by earthquakes. Now earthquakes are mainly submarine or follow 

 the borders of the continents. Here the mountain ranges have de- 



raphy, by permission of Ginn & Co., Publishers.) The reader should notice 

 crumpled in the uplift from the sea, which has receded westward 1,000 miles. 



PROC. AMER. PHIL. SOC. XLVll. 1 89 N, PRINTED SEPTE.MBER 22, igcS. 



