MemdirsCalAcad.Sci Vgliii. 



[Arnold j Pl^te: X>^III. 



Figure a. San Pedro. — Specimen of tlie fossiiiferous sand from the lower San Pedro deposits, San 



Pedro bluff, north of valley. Olivella intorta is the dominating species. 



Photograph by R. Arnold. 



Figure b, San Pedro.— SpecimSn of the fossiiiferous lower San Pedro sandstone from Deadman 

 Island. Photograph by R. Arnold. 



