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Figure a. San Pedro. — San Pedro bluff, looking southwest toward the San Pedro valley, showing lower 

 and upper San Pedro (Pleistocene) strata. (See Diagram D, Plate XXII, for explanation.) 



Photograph by R. Arnold. 





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Figure b. San Pedro. — San Pedro bluff north of valley, looking . .wing unconformiti . 



lower and upper San Pedro (Pleistocene) deposits. (See Diagrann D, Plate XXII, for explanation.) 



Photograph by Dr. H. W. Fairbanks. 



