B. N. A. BOUNDARY COMMISSION, 
ay ii) 
efferverces freely without the application of heat. ‘It is ha rd and 
DeeeRONBhICy, but close-grained, and not crystalline. ‘The col : 
shade to a rah bluish-grey ; some layers, ate however, a vol 
tinge. Weathered surfaces are pale-brown, fawn, or buff-coloured, ‘ 
show an irregularity of structure which is not apparent on fracture, 
seems to arise from the npeaye resistence to the weather of parts more — 
or less largely impr egnated with magnesia; the differentiation be gir aa 
produced by some sort of segregative action. The more highly magne: is 
layers are at times arranged in planes parallel to those of deposition,, b ae 
also, not infrequently, quite irrespective of it. 
134. Below the limestone the lowest beds here seen occur. They are Res 
composed of the variegated sandstones and slates of Series C. The she : ‘ 
mer are generally reddish and greenish, the latter grey and green, t ; 
there are also many bands of white quartzite of small thickness. a a 
marked unconformity between this series and the limestone is here . . 
observable, but subdivision 4 was not recognized, and it would seem that B 
the limestone here rests on No. 1 or 3. The sandstones and slates also 
seem to be much more metamorphosed than any of the rocks higher in 
the series, and are beautifully plicated on a small scale. 
135. I was unable to observe the rocks further west than this point : 
which is about five miles from the Flathead River. The mountains were 
here, however, decreasing in altitude, and the watershed range was nearly 
passed through. 
Rocks near the Boundary Monument. 
136. In the valley which runs south-eastward from the West Fork, 
and leads almost directly toward the Boundary Monument on the water- 
shed, the rocks exposed in the hill-sides are chiefly red, or reddish sand- 
stones, generally rather thin-bedded, but sometimes massive. They 
belong for the most part to the upper red Series G. Series HZ., composed 
of flaggy fawn-coloured beds, which are no doubt magnesian limestone or 
sandstone, forms the soft-outlined and crumbling summits of some of the 
mountains on the south-west side. These rocks—the highest observedin 
the mountain region—were not closely examined, though a greater or 
less thickness of them was frequently seen resting on Series G., and _ 2 
differing from it markedly in colour, it was always at.a great height 
above the valleys. 
137. The spot known as Camp Akamina, the eastern terminal — 

