46 The Siskiyou Island. 



These facts and the great extent over 

 which they prevail seem to prove a cause at 

 least as extensive as the miles they cover. 



We have now opened before as a new 

 chapter in the geological history of our coast, 

 the framework of the new order of things 

 traced in bold features. 



Its greater features are two fold; first, a 

 mountain range lifted from the bed of the 

 ocean nearly a hundred miles westward of the 

 Cascade barrier; second, a related trough 

 between these two extending along the entire 

 length of the coast from Southern California 

 to the Alaskan peninsula. 



Throughout this extent the unity of the 

 elevated mass receives recognition under the 

 name of the Coast range. The unity of the 

 related trough has not received a name to 

 cover its whole length, yet a moment's in- 

 spection will show the same unity among the 

 parts of the trough that is so carefully noted 

 in the uplifts. The San Joaquin and Sacra- 

 mento valleys of California, the Willamette 

 valley of Oregon, the trough of Puget sound, 



