456 Lancaster D. Burling — 



" Approximately at least, these beds are of the same age, and in a 

 general way, and as a diagnosis by exclusion, may be said to be 

 Chazy." 



§11. Euedemann -^ believes that this reference places too much 

 emphasis on differences in faunal composition, and states that both 

 faunas " cannot be far removed from early Trenton age ". Later on 

 in the same report,^ he says : " In all of these places Didymograptus 

 sagitticaulis occurs in the same horizon {Dicellograptus zone) as at the 

 Normanskill, with the exception perhaps of the Dease River locality." 



Allan ^ describes the graptolite shales as occurring in two infolded 

 bands in the Beaverfoot Range. He says : " The thickness of these 

 beds varies, and the lower contact is ill-defined, but there are at 

 least 1,700 feet of black fissile shales, many beds of which contain 

 graptolites." 



The latest reference to the age of these shales is by Bassler,* 

 who refers to them as Chazyan (Normanskill). 



§ 12. The fact that we have now secured data as to the relations 

 of the " graptolite shales " to the overlying formation, together with 

 palseontological evidence as to the age of the beds immediately 

 below, leads me to the conclusion that they should be named f 

 and since they were first found at Glenogle, and are there represented 

 by the most fossiliferous beds yet discovered, it would seem 

 appropriate that they be called the Glenogle shales. Such a name 

 will also call attention to their geographic position, a feature of 

 importance, since they are nowhere listed as occurring at Glenogle 

 but at a locality (Kicking Horse Pass) 25 miles away. The formation 

 is stated by Allan ^ to be at least 1,700 feet thick. Though he does 

 not say so, this figure is probably based upon measurements at 

 Glenogle. It appears to have a thickness of 700 feet in the summit 

 of the range 10 miles south of Glenogle. The type locality is at 

 Glenogle, in the first creek west of the station, and in. the adjacent 

 rock-cut in particular. The lower (Canadian) portion of the 

 formation can be studied in the bed of the first creek east of Glenogle, 

 and the overlying beds can be studied in the high summits to the 

 south. Near Glenogle the relations are destroyed by the presence, 

 between the two formations, of the Kicking Horse River. 



The railroad track here follows the north bank of the Kicking 

 Horse (Wapta) River, which has cut its canyon between a series of 

 very steeply inclined shales and a series of massive white weathering 

 quartzite beds whose dip-slope forms the southern side of the valley. 



The geological structure is that of a large overturn, and the shales 

 north of the river really underlie the massive beds across the river to 



1 il/eni. Neio York State Musuem, No. 11, pt. ii, 1908, footnote p. 25. 



2 Id., p. 251. 



3 Summ. Rep. Geol. Surv. Canada for 1912, 1913, p. 172. 



4 Bull. U.S. Nat. Mus., No. 92, 1915, p. 550, etc. 



5 See Burling, Abstract, Bull. Geol. Soc. America, vol. xxxii, 1921, p. 128. 



