Memoirs Cal Acad. 5ci . Ydl. m. 



[ARNDLDJ PlATE XXVII 



Figure a. San Pearo. — iMorth ena o+ tne San Pedro bluff, looking northwest, showing fossiliferou9 

 layers near top. Photograph by R. Arnold, 



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Figure b. San Peoro. — North end of the San Pedro tiluff, Iool<ln0 southwest, showlrtg fossiliicrOu^;- 

 layers at the bottom. Photograph by R, Arnold, 



