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Figure a. San Diego. — Bluff and beach at Spanish Bight, looking north, showing the very fossiliferous 



layer at the base of the bluff which also forms the beach at this point. 



Photograph by R. Arnold, 



Figure b. San Diego.-A closer view of the beach at Spanish Bight. Most of the shells seen in this 

 picture are In place in the hard Pleistocene sand layer which forms the beach at this point. 



Photograph by R. Arnold. 



