Pft icEEOiNGS Am. Philos. Soc. Vol. LII. No. 212 



Plate XLIII 



Fig. a. 



Fig. b. 



Fig. a. Riprap beach formed from thin sandstone beds intercalated with 

 Seattle shales at mouth of Sekiu River, north coast of Washington. 



Fig. b. Massive tuffaceous San Lorenzo shales (Astoria series) on Chehalis 

 River at Lincoln Creek, Washington. 



