Memoirs Cal Acad. Sc " 



[ARHDLdJ PlAi: 



Figure a. San Pedro. — North end of the San Pedro bluff, looking northwest, showing fossiiiferous 

 layers near top. Ri-ctograph by R. Arnold. 



Figure b. San Pedro.— North end of the San Pedro bluff, looking southwest, showing fossiiiferous 

 layers at the bottom. Photograph by R. Arnold. 



