Memoirs Cal Acad. Sci . Vol. hi. 



[Arnold] Plaie XXXVl. 





Figure a. San Diego.— Sea-cliff at Pacific Beach, lool<ing north, showing the 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-clift at Pacific Beach, looking 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. 



