CLASSIFICATION OF SPRINGS 



549 



dam springs (Fig. 13 c). The best-known examples are the 

 cienegas of the valleys of southern California. West of Cucamonga 

 (Fig. 16) a projection of older cemented alluvium in the Red Hills 





Cucamonga 



2 MILES 



Fig. 16.— Map showing rock-dam springs near Cucamonga, California. (After 

 Mendenhall.) 



produces East and West cienegas; a similar projection of the rocks 

 of the San Rafael Hills produces the springs of Devil's Gate, north 

 of Pasadena.^ In the Antelope Valley a part of the rock floor of 



'W. C. Mendenhall, "Ground Water and Irrigation Enterprises in the Foothill 

 Belt, Southern California," U.S. Geol. Survey, Water-Supply Paper 219 (1908), 

 pp. 34-38, 50-53- 



