PLATE 20 



Fig. 6. Series of pallets selected to illustrate variation at Crockett, San 

 Francisco Bay. 



Fig. 7. Series of pallets selected to illustrate variation at Dumbarton, San 

 Francisco Bay. 



Fig. 8. Series of pallets selected to illustrate variation at Goat Island, San 

 Francisco Bay. , 



[412] 



