in Vol. in. 



[ArmdldJ Plate XXVIII, 



Figure a. San Pedro. — Specimen of the fossiliferous 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, — Specimen of the fossiliferous lower San Pedro sandstone from Deadman 

 Island. Photograph by R. Arnold. 



