no. 5 pre-devonian paleozoic formations 281 



Lake Louise Shale ^ ^ , , , 



Feet Meters 



Dark, siliceous shale 28 8.5 



Fauna. — ■ 



Cntciana sp. 



Planolitcs sp. 



Fort Mountain Formation 



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 pebbles 



and bits of dark and greenish shale in coarse sand- 

 stone matrix. Several irregular lentils and thin bands 

 of shale occur in the lower portions 170 51.8 



Total of Fort Mountain formation 452 1377 



D I SCO N FORM IT Y 



ALGONKIAN 

 Hector Formation 



Greenish gray, siliceous shale with a massive- 

 bedded, very coarse conglomerate about 400 feet 

 (121.9 m.) below the Cambrian. 



The section is here cut off by a fault. 



Fossil Mountain Section 



The sections sotttheast of Ranger Brook in the Sawback Range 

 were not measured, nor those on the south side of Bow River nor to 

 the northwest for a distance of i8 miles (28.9 km.), as they are 

 essentially the same from Bow Valley to the head of Donglas Lake 

 Canyon. At Fossil Mountain, 21 miles (33.8 km.) northwest of 

 Ranger Canyon section, the strata beneath the Devonian are readily 

 accessible, and the section of the Sarbach and the upper portion of the 

 Mons is excellently exposed. The section was first .examined on the 

 southeast face of the mountain about 3 miles (4.8 km.) south of the 

 Red Deer River and 8 miles (12.9 km.) northeast of Lake Louise 

 Station on the Canadian Pacific Railway (see pi. 48). 



Fossil Mountain rises abruptly from the north side of Baker Lake 

 and slopes at about 25° to 30° to the west and more rapidly to the 

 east because the broken clitTs extend from near the summit down to 

 the long talus slopes. The strike of the strata on the east face of the 

 mountain is about north 15° to 20° west with a dip of 60° to 65° south, 

 30° west. On the west side a mass of reddish-brown sandstones and 

 arenaceous shales of the Hector formation of the pre-Cambrian 

 Beltian series has been thrust eastward so as to lie against and on 



