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"Valley," which slopes from the foot of the escarpment toward 

 the south. At the mouths of the canyons coarse gravel and 

 rock fragments of great size have been deposited by the tor- 

 rential streams at flood seasons. Great damage is done by un- 

 controllable floods which pour from the canyon mouths in 

 seasons of exceptional precipitation. 



If the foothill route is followed from San Bernardino to 

 Los Angeles a nearer view of the mountains will be afforded. 

 For convenience the towns en route and the more important 

 canyon mouths that will be passed are indicated. Citrus 

 orchards, grape vineyards, hot-dog stands, wine refectories, 

 gasoline filling stations, and other "filling" stations, divert the 

 attention from the great fault scarp of the mountains, but the 

 drive will be exhilarating, and will be greatly enjoyed by lovers 

 of nature; by those who see beyond the rocks to the forces 

 that have been long working in fashioning the landscape, over 

 which it is possible to travel at so great speed that what is 

 looked at may not be really seen. 



San Bernardino to Fontana (six miles); Etiwanda (12 

 miles) ; Day and Deer canyons are to the north. Cucamonga 

 (15 miles); Cucamonga Peak (El. 8,911 feet) frowns from 

 the San Gabriel Range, while the vineyards at the foot of the 

 mountain yield wine to cause a smile. Upland (21 miles) ; 

 Claremont (25 miles) ; on the alluvial fan of San Antonio 

 Creek, which pours out of Icehouse Canyon from the foot of 

 Mount San Antonio, locally known as "Old Baldy" (El. 10,080 

 feet) . San Dimas wash, from San Dimas Canyon, and the fan 

 of Dalton Canyon, are crossed east of Azusa (36 miles). San 

 Gabriel River flows from far up in the San Gabriel Mountains 

 through a steepwalled canyon cut in hard diorite and meta- 

 morphosed sedimentary and igneous rocks, and flows directly 

 across the San Gabriel Valley, and has built an extensive alluvial 

 apron or "wash" of boulders, gravel and sand, south and west 

 of Azusa. West of Arcadia (45 miles) turn southwest on 

 Huntington Drive, to Alhambra and Los Angeles. North and 



