29 



COAST RANGES 



OF THE PACIFIC AND THE 



SAN ANDREAS FAULT SYSTEM 



MAJOR DIVISIONS 



A belt of mountains parallels the present coast in Washington, Oregon, 

 and California and, except as noted, the mountains are known as the 

 Coast Ranges. They are separated from more interior chains by broad 

 depressions, in Washington and Oregon called the Willamette-Puget 

 Sound depression, and in California called the Great Valley. The index 

 map, Fig. 29.1 shows these features. The Coast Ranges have had a pro- 

 longed Tertiary and Quaternary history, and their development occurred 

 parallel in time with the Laramide Rockies and the ranges and valleys of 

 the Great Basin. 





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Fig. 29.1. Index map of the Coast Ranges and associated geological provinces of Washington, 

 Oregon, and California, showing the lines of cross sections and the San Andreas fault and 

 possible associates. 



452 



