15+ SOUTHERN CALIFORNIA GEOLOGY 



The location of each of these must be briefly indi- 

 cated and defined, inasmuch as several of them have 

 heretofore never been mapped or even mentioned. 

 Uncertainty as to the exact number is due to the lack 

 of more detailed research, especially on the Desert side. 



THE NOORTHWEST STRUCTURES OF THE 

 DESERT SIDE 

 Far out on the desert side, thanks again to the new 

 maps and relief models thereof made by the City of 

 Los Angeles, we get new light upon this second south- 

 west system of structures, for there one will find some 

 wonderful examples of the northwest-southeast rifts 

 not hitherto described, and of which there are at least 

 two principal ones, if not more, as indicated on Plate I. 



THE CADIZ AND NEWBERRY FAULT LINES 



The Cadiz and Newberry faults, with a chain of great 

 trough-like valleys between them, are about twenty-five 

 miles apart and run southeastward from the north- 

 easterly-extending Oarlock fault near Randsburg and 

 Mojave respectively for distances of one hundred and 

 fifty miles in California to the Colorado River, which 

 they cross on either side of Blythe. Between these 

 two more conspicuous, parallel faults is a chain of 

 elongated, lower-lying, desert valleys which are fol- 

 lowed by the Santa Fe Railroad between Barstow and 

 Blythe and which I herein refer to collectively as the 

 Valleys. These Valleys apparently represent a vast 

 structural trough between the adjacent master fault 

 lines mentioned. They are the easternmost of a 

 second belt of northwest extending faults supposed- 

 ly of Pleistocene and older ages which are succes- 

 sively encountered in crossing Southern California 



