128 DEPARTMENT OF THE INTERIOR 



2 GEORGE V., A. 1912 



potash to the orthoclase molecule, the iron oxides to magnetite, and the residual 

 silica to quartz, the following ' norm ' has been calculated for the rock : — 



Quartz 25-5 



Albite molecule 23-0 



Orthoclase molecule 8-3 



Anorthite molecule 10-5 



Magnetite 2-5 



Calcium carbonate 23-0 



Magnesium carbonate 5-0 



Kemainder 2-2 



100-0 



In general this ' norm ' is not far from representing the actual mineralo- 

 gical composition of the rock. The unexpected abundance of the soda again 

 raises the suspicion, here as in the study of the analyzed western phase, that 

 paragonite is really present; how far the 'norm' deviates from the 'mode' in 

 this respect cannot be declared. 



Chemically and mineralogically the rock has certain features of each 

 of the three different types : — a f eldspathic quartzite like the type of the western 

 phase of the Creston formation; a metargillite like that dominant in the Mac- 

 Donald or Appekunny formations; and a magnesian limestone. The size of 

 grain of the carbonate is close to that characterizing the Altyn dolomite and 

 other carbonate-bearing members of the Galton and Lewis series. This eastern 

 phase may thus be a rock-type transitional between the western phase and the 

 rocks composing the Waterton, Altyn, and Appekunny formations. 



Kitchener Formation. 



At all the localities where the two formations have been seen in contact, 

 the Creston passes quite gradually into the conformably overlying Kitchener 

 formation. The change from one to the other is so gradual, and the lithological 

 differences between the two are of so low an order that, as already noted, the 

 mapping of these formations offered considerable difficulty at many points in 

 the Boundary belt. Much additional field work and the discovery of more 

 favourable sections will be necessary before the Kitchener formation can be 

 described in detail. 



It is convenient and instructive to group the facts known about the 

 Kitchener into a statement regarding both a western and an eastern phase. 

 Where outcropping in the Moyie and Yahk ranges, the dominant rock belongs 

 to the western phase; the western slope of the McGillivray range bears thick 

 masses of strata belonging to the eastern phase. Finally, on the eastern slope 

 of the McGillivray range, the eastern phase of the Kitchener was found to be 

 so far changed as to be, for hundreds of feet together, indistinguishable from 

 the Siyeh formation. So, in fact, the rocks of the McGillivray range, have 

 been mapped with the express recognition of the stratigraphic equivalence 

 between the Siyeh and the main mass of the Kitchener. (See map sheets Nos. 

 3 and 4.) 



