B. N. A. BOUNDARY COMMISSION. 
apparent. There seems, however, to be above the red band, a cor 
able thickness of slaty rocks, which are altogether wanting in the 
section. 
Rocks in the Kootanie Pass. 
123. The beds of Series ©. are, however, best displayed in the sid 1 
of the South Kootanie Pass,—which enters the mountains three and at ? 
half miles north of Waterton Lake,—and were there separated for cor sa ; 
venience of reference into five subdivisions. The rocks at the entrance ce Re 
to the pass have a general south-westerly dip. The lowest seen were in * 
the bed of the brook, and must be well down in the series. They consist a 
of hard greenish slates and compact thin-bedded quartzites, much resem- a 
bling those underlying the magnesian sandstone, in the last mentioned : 4 
locality. In the mountain on the north side these were seen to be over- ae om 
laid by reddish, greenish, and bluish-grey sandstones, with some slaty 3 
beds, all considerably altered; but which form a talus, and are not very a 
well exposed. These were designated subdivision 1. ; 2 al 
124. About midway up the mountain, a massive bed of magnesian 
sandstone or grit, appears, and constitutes subdivision 2. It must be 
about fifty feet in thickness, and great blocks of it which have broken off 
from time to time, are now strewn round the foot of the slope, and 
encumber the pass. It no doubt corresponds with one of the similar- 
beds already described as occurring near Waterton Lake, and lithologi- 
cally, also bears a close resemblance to that intercalated in Series B. It 
is composed of large well-rounded grains of transparent quartz, with 
occasional darker particles—the whole imbedded in an opaque white 
calcareous and magnesian matrix, which rapidly turns brown on exposure 
to the weather. m 
125. Next in the series, and forming the summit of this mountain, is . 
a considerable thickness of red, greenish, and bluish-grey sandstones and 
slates ; which, by their alternation give the cliffs a curious banded appear- 
ance. They resemble those of subdivision 1, and may be named 
subdivision 3. 
126. A series of bright-red beds appears on the slope of the mountain ' 
on the south side, overlying the last; they constitute subdivision 4, and 
represent those already noticed as occurring in Mt. Wilson and elsewhere. — 
In following the trail along the north side of the valley, they come down 
almost to the level of the brook, about one and a quarter mile from the 
entrance of the pass. Their thickness at this place must be about two 

