NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS I99 



In several localities stratified, nonfossiliferous deposits occur be- 

 tween the base of the Middle Devonian and the subjacent fossiliferous 

 rocks of the lower Paleozoic. For two of these deposits, the exact 

 ages of which are unknown, I have proposed the names Ghost River 

 and Mount Wilson formations. Deposits at other localities have not 

 been named as they consist of only a few feet of shale and their dis- 

 tribution has not been traced for any considerable distance. For 

 discussions of these formations see pages 210, and 208. 



The extent of the time interval and magnitude of the stratigraphic 

 break in the Ghost River section are indicated by the presence of 

 about 25,000 feet (7,620 m.) of strata in the Bow-Kicking Horse 

 Pass and River sections, between the lower part of the Middle Cam- 

 brian and the Middle Devonian Messines limestones, that are not 

 present at Ghost River. These formations include : 



Silurian : Feet Meters Feet Meters 



Brisco formation 1,200 365.8 



Beaver foot formation 400 12 1.9 



Canadian : 



Glenogle shales 1,700 -|- 518.2 -f' 



Ozarkian (Lower and Upper only) : 



Mons and unnamed formations... 3,800 1,158.2 



Upper Cambrian (Lower and middle 

 portions only) : 



Goodsir formation^ 6,040 1,841.0 



Ottertail limestone 1,825 556.3 



Chancellor formation 4,500 i. 371.6 



Sherbrook formation i,375 4i9-i 



Paget formation 360 109.7 



Boswortii formation 1,587 483.7 



Arctomys formation 268 81.6 



Total Upper Camlirian... 15,955 4,863.0 



Middle Cambrian : 



Eldon formation 2,728 831.5 



Stephen formation 640 195.1 



Cathedral formation 1,212 369.4 



Total Middle Cambrian.. 4,580 1,396.0 



Total 25,635 8,423.1 



Of the above formations the Brisco, Beaverfoot, Glenogle, and 

 Mons were deposited in the Beaverfoot Trough ; the Goodsir, Otter- 



^ In Walker's section at the head of Windermere Canyon the Glenogle is 

 given a thickness of 2,152 feet (655.9 in.). 

 ^ See footnote p. 200. 



