174 DEPARTMENT OF TEE INTERIOR 



2 GEORGE V., A. 1912: 



Table V. gives actual densities in a part of the Cordilleran region and 

 may possibly be of some value in discussions of pendulum observations or of 

 other geophysical problems as they may be concerned with this region in the 

 future. 



The averages of Table VI. express the range of densities in a typical,, 

 thoroughly consolidated (statically metamorphosed) geosynclinal prism. 



Table VII. indicates the approximate density relations of the Galton series, 

 the least completely exposed series from the prism, to those of the equivalent, 

 strata of the other three series. The average densities of the two western 

 equivalents are sensibly the same as that of the Galton series. On account of 

 the extensive development of dolomite in the Lewis series, its average density 

 is, as was to be expected, considerably higher than that of any other of the 

 series. 



Correlation of the Four Boundary Series with the Castle Mountain-Bow 



Biver (Cambrian) Group. 



During the course of the field work in 1905 it gradually became suspected 

 that the as yet unfossiliferous Siyeh limestone is the stratigraphic equivalent 

 of the Cambrian Castle Mountain limestone of McConnell's well-known section 

 on the main line of the Canadian Pacific railway. This suspicion was- 

 strengthened in the course of a brief examination of the rocks at and east of 

 Mt. Stephen in the autumn of that year. The importance of the correlation 

 prompted a second and longer field-study which might, to some extent, supple- 

 ment McConnell's all-too-brief report on the great section. Toward the close 

 of the season of 1906 the writer accordingly spent five days in working over 

 the type sections on the northeast and southwest sides of the Bow river valley. 

 The time available was too limited to secure a detailed columnar section of 

 the group; yet the field evidence was clearly in favour of the correlation of the 

 Siyeh and Castle Mountain formations. 



The principal information was obtained from two partial sections, the one 

 running northeastward from Eldon station to the 9,800-foot, unnamed summit 

 northwest of Castle mountain; the second, running westward from Lake Louise 

 chalet to the base of Popes Peak. Combining the results of the two traverses^ 

 the following succession was established : 



Top, erosion surface. 



3,500 feet. — Impure magnesian limestone with thin interbeds of shaly metargillite.. 

 1,500 " Quartzite in. thin to thick beds. 



1,200+ " Fine-grained conglomerate, grit and quartzitic sandstone. 



Base concealed. 



Reference to the published report and, afterwards, personal consultation 

 with Mr. McConnell, gave assurance that the limestone typically represented 

 the Castle Mountain formation in its lower part, while the quartzites, conglom- 

 erate, and grit as typically represented the Bow Biver formation in its upper 

 part. 



