Columnar Section of the Grays Har- 

 bor AND Chehalis Valley District. 



Columnar Section of Puget Sound 

 AND THE San Juan Islands. 



Admiralty till 



Empire formation 

 sandstones and tuffaceous shales with 

 basalt tuffs at base, west and north of 

 Chehalis Valley. 



4,000' 



Monterey formation 

 sandstones and clay shales south of 

 Chehalis Valley. 



4,000' 



Seattle formation 

 tuffaceous s.s. and sh. of Dela- 

 zine Cr. 



1,600' 



San Lorenzo formation 

 tuffaceous sandstone and shale 

 at Lincoln Creek and north of 

 Oakville, Porter, and Elma 

 with basalts at base. 

 3,000' 



Chehalis formation 

 tuffaceous lignitic sandstones 

 and shales, marine and estuar- 

 inewith interbedded basic flows 

 and tuffs at Chehalis and the 

 Balch syncline. 



9,000' 



Bedrock complex 



Saanich formation, 50' 



Vashon drift 



Admiralty till 



Seattle formation 



conglomerates and tuffaceous 



sandstones and shales of the 



Seattle monocline. 



4,000' 



San Lorenzo formation 

 tuffaceous sandstones and 

 shales with basalts and ande- 

 sites at base, of Bean Point and 

 Port Townsend. 



5. 000' 



Oleqiia formation tuffaceous 

 lignitic sandstones and shales 

 of marine and estuarine origin 

 forming the coal series of What- 

 com County and the upper 

 12,000' of the Pierce County 

 section. 



Chehalis formation 

 tuffaceous lignitic sandstones 

 and shales of marine and es- 

 tuarine origin of Fairfax and 

 the Pierce County coal field. 

 5,000' 



Bedrock complex 



