SCIENTIFIC BACKGROUND 157 



jave Desert towards the Colorado River. This area 

 includes several long and narrow ranges of northwest- 

 southeast direction which project above wider valleys 

 of desert waste: the Bristol, Bullion, Iron, Granite, 

 Sheepshead and other ranges. The relationship be- 

 tween the ranges, valleys and fault lines of north- 

 south, east-west and northwest-southeast trends which 

 meet and interfere with one another here may only be 

 appreciated by studying the new maps, 



THE NEWBERRY FAULT 



About thirty miles southwest of the Cadiz fault and 

 almost parallel to it there are evidences both in the 

 stratagraphy and topography of another great fault. 

 This extends through the north border of the extensive 

 highland known as the Bullion and Sheep Hole Moun- 

 tains. It also passes the north end of the Coxcomb 

 and Palen Ranges and the south end of Granite Moun- 

 tain. This line, too, is a narrow zone of faults which 

 down-step to the north so as to oppose the south throws 

 of the Cadiz faults. The topography suggests that 

 it, too, is accompanied by a subordinate parallel line 

 of faulting, about five miles distant to the north of 

 the main line. 



Like the Cadiz fault, the Newberry fault apparently 

 begins at the Garlock Fault on the northwest and ex- 

 tends southeast into Arizona. It intercepts the Colo- 

 rado River somewhat south of the town of Blythe. 



THE AMBOY TROUGH 



The path of the Santa Fe Railway from east of Bar- 

 stow southeastward to Blythe on the Colorado River 

 finds a natural "easiest way" by following a chain of 

 desert valleys which lie between the Cadiz and New- 



