NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 305 



Three miles (4.8 km.) to the north-northeast, on the northeast side 

 of Ptarmigan Peak, the Fort Mountain formation is much thinner. 

 A measured section gave : 



Feet Meters 



1. Thick-bedded, light gray, occasionally cross-bedded 



quartzitic sandstone with a little trace of purple color 



in a few layers 260 79.2 



2. Light gray to brownish-gray sandstone in thin layers.. 22 6.7 



3. Massive-bedded conglomerate, with white quartz peb- 



bles and fragments of dark and greenish, fine arena- 

 ceous shale in a coarse sandstone matrix 170 51.8 



Total 452 137.7 



Mount Odaray Section 

 The northeast cliff of Mount Odaray, 7.5 miles (12.1 km.) south- 

 west of Mount Whyte, gives a section estimated at over 3,000 feet 

 (914.4 m.) : 



Feet Meters 



Stephen formation 200" 60.9 



Cathedral and Ptarmigan formations i,200' 365.8 



Mount Whyte 250 76.2 



St. Piran 1,500 457.2 



Total 3.150 960.1 



Mount Schaffer Section 

 LOWER CAMBRIAN 



Mount Whyte Formation 



The Mount Whyte formation on the southwest slope of 

 Mount Schaffer, on the trail to Lake McArthur, 

 7.5 miles (12.1 km.) south of Hector Station on the 

 Canadian Pacific Railway, and 4.75 miles (7.6 km.) 

 south-southwest of the Mount Whyte section, was 

 hastily measured in 1910. The thin-bedded arena- 

 ceous limestones that extend up to the massive- 

 bedded Cathedral limestone were not measured. They 

 may represent the Ptarmigan formation of the Ptarmi- 

 gan Peak section. 



1. Gray arenaceous and siliceous limestone, with irregular 



cherty stringers in line of bedding 20 6.1 



2. Gray arenaceous thin-bedded limestone, with finely 



oolitic layers of purer limestone 15 4.6 



Fauna. — (6id) : (collections from more than one zone.) 

 Paterina labradorica (Billings) 

 Iphidella panmda (White) 

 Acrotreta sagitfalis taconica Walcott 

 Jamesella lowi Walcott 



