Memoirs Cal Acad. Sci.YDL.m. 



[Arnold] Vlkte XXXVl. 



Figure a. San Diego. — Sea-cliff at Pacific Beacin, lool<ing north, sinewing tlie base of the slightly tilted 

 sandstone of the San Diego formation (Pliocene), resting on massive gravels and conglomerates. 



Photograph by R. Arnold. 



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Figure b. San Diego.-Sea-oliff at Pacific Beach, lool<ing north from a point one-half mile north of 

 Ocean Front, showing slightly tilted sandstones of the San Diego (Pliocene) formation capped by horizontal 

 upper San Pedro (Pleistocene) gravels. 



Photograph by R. Arnold, 



