GENERALIZED SECTION 



723 



pie), and because these mountains are those closest to and most easily 

 climbed from the usual camp, at the foot of Robson Glacie7\ For this 

 reason the writer feels that he sliould not postpone ]niblicati()ii until the 

 faunas can be worked up. 



Gkkeralized Section, Mount Robson Region (§2) 



Walcott 





Burling 







Feet 





Feet 



Ordovician : 





Ordovician : 





Rolison limestones (§23).... 



3,000 



The Robson limestones are 





Massive and thin-bedclecl 





not known to be present 





limestones, partly arena- 





in the Mount Robson re- 





ceous and dolomitie. 





gion (§23fZ), the top of 





Fossils : "Near the base" 





Mount Robson appearing 





(from the Extinguisher), 





to lie at or very close to 





"where there is a com- 





the horizon of the Ex- 





mingling of Upper Cam- 





tinguisher fauna instead 





b r i a n and Ordovician 





of 3,000 feet above it. 





types" (§2.3c); "also 





There is a thin-bedded se- 





higher up" (drift blocks 





ries of shales and in- 





in a moraine) , "where 





traformational conglom- 





numerous Lingulse of Or- 





erates, carrying Ordo- 





dovician characteristics 





vician fossils, above the 





occur" (§23&). 





top of the Lynx forma- 

 tion. These are exposed 

 in the Extinguisher and 

 in the summit of Mount 

 Rearguard, where they 

 are^-ut off by erosion 375 

 feet above the base. They 

 are unnamed in this 

 paper (§23/). 





Total Ordovician 



3,000 



Total Ordovician 



375 









Upper Cambrian : 





Upper Cambrian : 





Li/nx limestones ( § 24) 



2,100 



Lyn.r forth Hon (§24) 



5,000 



Thin-bedded gray and blu- 





More or ,3ss thin and ir- 





ish gray limestone with 





regularly bedded series 





band.« of shale. 





of limestones and shales, 

 marked at the base by 

 ripple-marks, mud-cracks, 

 and casts of salt crystals. 

 Thickness obtained in 

 Mounts Lynx and Rear- 

 guard (§§14. 18, 24). 





Fossils : None. 





Fossils : Abundant and in 

 a score or more horizons. 





Total Upper Cambrian 



2,100 



Total Upper Cambrian 



5,000 



