Memoirs Cal Acad. Sci, Vol. m. 



[Arnold] Piaie W^n 



Figure a. San Diego.— Sea-ci iff at Pacific Beach, looking north, showing the base of the slightly tilted 

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



Photograph by R. Arnold. 



Figure b. San Diego.— Sea-cliff 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. 



