348 Adventures, in Scenery 



6,750 feet; 47 miles from San Bernardino), is one for the safe 

 and sane driver. A fine paved road with hair-pin curves winds 

 up the mountain slope and along the rim of the plateau. If 

 you are in a hurry do not go. Splendid hotels and excellent 

 accommodations, with facilities for entertainment, are avail- 

 able. 



West through San Gabriel Valley 



From San Bernardino west two principal highways vie with 

 each other to give the tires of your car footing. The San Ber- 

 nardino Mountains are separated from the San Gabriel Range 

 by Cajon Canyon, through which runs San Andreas fault. The 

 south wall of the San Gabriel Mountains is the escarpment of 

 the Sierra Madre fault. This fault extends west to Glendale 

 and the San Fernando Valley. Cajon Canyon, which separates 

 the two mountain ranges, meets Lytle Creek, and the two 

 streams debouch upon the plain in a broad alluvial apron or 

 "wash." The gravelly "wash" or apron formed by the com- 

 bined detritus of Cajon and Lytle streams is about 10 miles 

 across, and extends to the Santa Ana River. To the east of the 

 Cajon-Lytle Creek wash is the San Bernardino Basin. To the 

 west, along the foot of the fault scarp of the San Gabriel Moun- 

 tains, is the so-called San Gabriel Valley. The "Valley" is the 

 sunken plain which was depressed (probably) at the time the 

 San Gabriel Mountains were uplifted, and which has since been 

 filled by detritus washed from the mountains. The floor of 

 the valley is approximately 1,000 feet below the present surface. 

 The plain of "San Gabriel Valley" is a succession of alluvial fans 

 formed by the mountain streams which descend from the high 

 lands through steep-walled canyons, and debouch upon the 

 plain of the "Valley." 



Alluvial Aprons or "Washes" Make up Floor 



of San Gabriel Valley 



Many fine orchards of citrus trees and grape vineyards 

 flourish on the sandy "wash" soils of the alluvial plain of the 



