Columnar Section of the Straits of Fuca and West Coast of the 

 Olympic Peninsula. 



Admiralty till 



Merced formation, 400' 



Empire formation 



sandstones of Bogochiel River, tuffa- 



ceous shale of Taholah. 



1,600' 



Monterey formation 

 lignitic sandstone of Clallam Bay sec- 

 tion. 



2,000' 



Ttvin River formation 

 clay shales of Twin River sec- 

 tion. 



2,000' 



Seattle fortnation 



tufTaceous shale and sandstone 



of Sekin River and Gettysburg. 



3,000' 



San Lorenzo formation 

 tuffaceous shale and sandstone 

 of southwest coast of Van- 

 couver Island, heavy conglom- 

 erates of the Cape Flattery 

 section. 



17,000' 



Sooke formation 

 sandstones and conglomerates of Muir 

 Creek. 



1,600' 



Arago formation 



basalt tuffs of Port Crescent 



and west of Discovery Harbor. 



3,000' 



Bedrock complex ^e—i JL..- 



I 



