SCIENTIFIC BACKGROUND 137 



Transverse Belt which, as previously mentioned, ex- 

 tend in irregular sequence and sometimes in indefinte 

 expression from the westernmost end of the Channel 

 Islands eastward to and beyond the Colorado River 

 into Arizona, where they are associated with the 

 southward discontinuation of the Colorado Plateau. 

 These features are reflected in the relief of both sea 

 and land, and on both the Pacific and Desert sides. 

 Among the highlands which are delineated in part by 

 the east-west structures are the Santa Ynez, Santa 

 Monica, San Gabriel, San Bernardino, Little San Ber- 

 nardino, Eagle, Pinto and others, and more or less 

 the Anacapa group of islands. The Santa Barbara 

 Channel, the Foothill Valley, Rabbit Springs, Dole and 

 Chuckwalla Valleys are some of the lowland features 

 which accompany these Transverse structures. 



THE ANACAPA LINEAMENT 



The Transverse Belt is accompanied by many mas- 

 ter fault rifts of great conspicuity, some of which 

 are herein announced for the first time, while the ex- 

 istence of others has only been grudgingly admitted. 

 One line of faults, which I will term the Anacapa Linea- 

 ment, extends almost continuously across the state 

 from the south end of San Miguel, the westernmost of 

 the Channel Islands, to the Colorado River 500 miles 

 east. 



I consider this line to be one of the most conspicuous 

 and important structural lineaments in all California. 

 To its presence we owe many greater scenic features, 

 such as the islands, the Santa Monica coast, the 

 Beverly, Hollywood and Pasadena foothills, the great 

 south-front of the San Gabriel Range, and remark- 



