598 ARNOLD AND HANNIBAL— MARINE TERTIARY [April 19, 



these hollows were filled by freshwater lakes and gradually silted up 

 as Swan Lake and others on the Saanich peninsula are yet doing. 



With the Saanich formation are tentatively included the wide- 

 spread raised beaches on the west coast of Oregon and Washington 

 containing marine shells at Cape Blanco, Bandon, and Newport in 

 the former state and at Bay Center in the latter. Reagan'^ mentions 

 the occurrence of marine shells in Pleistocene deposits at Beaver 

 Prairie on the Olympic Peninsula, but the locality here is an old 

 kitchenmidden. 



Partial List of Species in the Saanich Formation (Pleistocene) of Puget 



Sound and the Straits of Georgia. 

 Pelecypoda : 



Cardium corbis Mart. 



Cardium decoratum Grnk.^^ 



Macoma calcarea Gmel. 



Macoma inquinata Desh. 



Macoma nasiita Conr. 



Mya arenaria L.^^ 



Mya truncata L. 



Mytilus edulis L. 



Papliia staiiiinea Conr. 



Paphia tenerrima Conr. 



Pecten islandirus Mull.^^ 



Pecten hastatus hericeus Gld. 



Saxicava arc tic a L. 



Saxidomus giganteus Desh. 



Serripes groenlandicus Gmel. 



Schizothaerus niittalli Conr. 

 Gasteropoda : 



Buccinuni percrassum Dall. 



Natica clausa B. & S. 



Nucella lamellosa Gmel. 



Polinices lewisii Gld. 



Geological History, 



The Coast Range of Oregon and the Willamette Valley. 



The Coast Range, Willamette Valley, and Cascade Range of 



Oregon as has been intimated in the discussion of the Arago lavas 



were apparently built up during Eocene time as a gently westward 



58 Geological Papers Kans. Acad. Sci., 1908, p. 229. 

 ^^ Species now native only to northward. 



