NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 327 



(86.9 km.) northwest of Ghost River section ; and 26 miles (41.8 km.) 

 north-northeast of Mount Dennis section of Allan. It is about 20.5 

 miles (33.0 km.) in an air line north of Lake Louise Station. It 

 includes the Devonian beneath the Banff shale of the Carboniferous ; 

 the Ordovician, Sarbach formation ; the Ozarkian, Mons formation ; 

 and the Upper Cambrian, Lyell formation. 



The upper broad canyon of the Siffleur River north of Pipestone 

 Pass is largely eroded in the Banff shale, which is superjacent to 

 the light gray Devonian limestone well exposed at Pipestone Pass, in 

 Devon Mountain and its northward extension to the head of Clear- 

 water Canyon ; the latter cuts through the Devonian beds nearly at 

 right angles to their strike, and southwesterly dip. 



Clearwater Canyon Section 



The Pipestone formation of the Devonian of Devon Mountain * 

 was not measured in detail, but it was estimated to be at least 1,200 

 feet (365.8 m.) in thickness. The measured section began about 1.5 

 miles (2.4 km.) east of the Divide at the head of Clearwater Canyon, 

 which is formed of an old lateral moraine of the glacier that flowed 

 down the Sififleur Canyon from Pipestone Pass. Clearwater Canyon 

 has an east and west trend for about 4 miles (6.4 km.) before curv- 

 ing to the north-northeast. The section was studied and measured 

 on the south side of the canyon down to 2 of the Sarbach formation 

 (see pi. 78), and then along the north side down into the Lyell 

 formation (pi. 80). 



DEVONIAN 



Pipestone Formation (Upper Devonian) p^^^ Meters 

 I. Light gray, evenly-bedded limestone in layers from 

 3 inches (7.6 cm.) to 2 feet (.6 m.) in thickness. Esti- 

 mated 1,200 -|- 365.8 4- 



Fauna. — I collected a few fossils in upper part at Pipestone 

 Pass, which Dr. Edwin Kirk of the U. S. Geological 

 Survey identified as follows : 



Pachyphyllum woodmani (White) 

 Cyathophyllum sp. 

 Heliophyllum sp. 

 Striatopora sp. 



^The sharp point rising on the east side of Pipestone Pass is named Devon 

 Mountain (9,300 -{- feet, 2,834.6 -(- m.), and the glacier on its northeast side, 

 facing Clearwater Canyon, Devon glacier. The peak is formed of Devonian 

 rocks, and the glacier rests in a cirque eroded in the same. Name approved by 

 Geographic Board of Canada, February, 1924. 



