NO. 12 CAMBRIAN FORMATIONS ROBSON PEAK DISTRICT 



341 



SUMMARY OF ROBSON DISTRICT 



STRATIGRAPHIC SECTION 



Formation 



Character 



Estimated 



thickness 



in feet 



Unconformity 

 Algonkiani^ C Miette 



fMassive and thin-bedded limestones 

 i partly siliceous, arenaceous and dol- 

 l^omitic 



\ Thin-bedded gray and bluish-gray 

 i limestone with bands of shale 



fMassive beds of thin layers of 

 bluish-gray limestone interbedded 

 with bands of dolomitic limestone 



f Massive-bedded gray arenaceous 

 ) limestones 



( Alternating bands of thin layers of 

 ] arenaceous limestones and shales. . 



( Massive-bedded gray arenaceous 

 ] limestone 



] Bluish-gray thin-bedded limestones 



["Gray arenaceous limestone, alter- 

 j nating with massive quartzitic sand- 

 LStone 



^ Massive-bedded quartzitic sand- 

 ) stone with bands of siliceous shale 



^ Siliceous shale and interbedded 

 ] siliceous limestones 



\ Quartzitic sandstones 



Cambrian sediments 



^ Massive gray sandstones with inter- 



] bedded siliceous shales 



Base concealed. 



3,000 

 2,100 



2,200 



600 



1,700 



800 

 900 



800 



1,800 



800 

 500 



12,200 



2,000-|- 



For purposes of comparison a summary of the Bosworth section 

 as it occurs along the Kicking Horse Pass route of the Canadian 

 Pacific Railway is inserted here, as published in 1908.' 



* Smithsonian Misc. Coll., Vol. 53, No. 5, igo8, pp. 216, 217. 



