258 DEPARTMENT OF T\HE INTERIOR 



2 GEORGE V., A. 1912 



tion itself was unknown and was not determined until the camp had boen 

 moved many miles to the eastward. Since then no favourable opportunity has 

 arisen by which the study of this quartzite could bo continued in the field. It 

 is now only known that, throughout most of the meridional belt of the Kitch- 

 ener quartzite as mapped on the west side of the Kootenay, the rocks are indis- 

 tinguishable from types of the Kitchener strata collected at the Moyie rivor. 

 The staple rock is a greenish gray quartzite, weathering brownish. Under the 

 microscope the dominant quartz is seen to be regularly associated with small 

 grains of microperthite and orthoclase, with generally a little plagioclase, a 

 few zircons, and pyrite crystals. There is always mica present, generally 

 colourless and sericitic, though minute biotites are seemingly never absent. 

 Where the quartzite is cleaved, as it is at certain points north of Corn creek, 

 the micas are specially developed in the cleavage planes. The metargillitic 

 interbeds have not been microscopically examined but they appear to be com- 

 posed of the same materials as the metargillites of the Kitchener formation. 



It is equally true that this local quartzite-metargillite series is lithologically 

 similar to the Beehive formation as developed on the summit of the range. 

 This is, of course, natural if the writer is correct in correlating the Kitchener 

 and Beehive quartzites. 



At Summit creek and north of it for a half-mile the quartzite is extremely 

 massive and of a gray colour when fresh, and very often grayish to light brown- 

 ish-gray when weathered; it is possible that here we have a large outcrop of the 

 Creston formation underlying the Kitchener. There is so little certainty of 

 this, however, that the colour representing the Kitchener on the map has been 

 extended northward across Summit creek. 



North of Summit creek the strike averages about N. 16° E., and the dip is 

 about vertical. The same strike (dip observed at 60° E.) is preserved fairly 

 well for a couple of miles south of the creek when it abruptly changes to N. 22° W. 

 then to N. 90° E., becoming highly variable in a locality of structural turmoil. 

 A half-mile farther south the strike is N. 45° E., and the average dip about 50° 

 S. E. This general attitude of the beds was observed at several points south 

 of Corn creek. On the whole it must be said that the strike of the quartzite 

 is distinctly transverse to the trend of the Burcell Trench. 



The western limit of the quartzite is shown on the map only approximately. 

 For the reason already noted, the amount of structural and areal work done 

 in the field was insufficient to show that limit and therewith the exact place of 

 the postulated master fault. Eew points in the structure section along the 

 Forty-ninth Parallel are more important than this one and it is especially here 

 that further and more detailed work is needed. 



Priest River Terrane. 



It has already been noted that the basal conglomerate of the Summit series . 

 rests unconformably on older rocks outcropping at, and to the eastward of, the 

 bead-waters of Priest river. The name ' Priest Biver terrane ' may be appro- 



