Memdirs Cal Acad. Sci. Vol m. 



[AhnoldJ Plate XXXV. 



Figure a. San Diego. — Bluff at foot of Twenty-sixth street, looking north, showing the fossiliferous 



upper San Pedro (Pleistocene) deposits in the lower half of the bluff. The Anomia limatula bed is at the 



very base of the bluff and forms the reefs at the right of the picture. 



Photograph by R. Arnold. 



Figure b. San Diego. — Small section of the sea-cliff at Pacific Beach, showing Pecten expansus and 

 Opalia varicostata in the matrix of the San Diego formation (Pliocene). 



Photograph by R. Arnold. 



