NO. I FORMATIONS OF BEAVERFOOT-BRISCO-STANFORD RANGE 9 



Banfif-Windermere motor road passes through it and the ^ ological 

 formations are cut across at nearly a right angle to the strike of the 

 strata. 



O. Sabine Mountain at the southwest end of Stanford Range. 



STRATIGRAPHIC SECTIONS 

 SINCLAIR CANYON SECTION 



The Sinclair section is taken as the standard section of the Brisco- 

 Stanford Range. Sinclair Mountain is the first mountain south of 

 Sinclair Pass and forms the north end of the Stanford Range, west 

 of and above the Kootenay River Valley and east of the Columbia 

 River Valley. The summit of the range at this point is formed of 

 dark Silurian limestones. The section above the Ordovician was not 

 measured or studied in detail at this place, and the thickness is based 

 on estimate. The measured section extends down the northwest 

 ridge (Wonah Ridge) into Sinclair Canyon. There is ho indication 

 of the Devonian above as it occurs in the Beaver foot Range to the- 

 north. Sinclair Canyon broadens out in its upper portion, where it 

 cuts throjugh a broken dome of Silurian, Ordovician and Ozarkian 

 strata. Erosion has cut deep into the central portions of the dome, 

 exposing an almost continuous section on the northeastern side of 

 Wonah Ridge^ from the massive limestones of the Silurian well down 

 into the Ozarkian. (See pi. 4. fig. i). The canyon further down cuts 

 through the southwestern side of the dome so as to expose parts of 

 the same section as that on the slope of Wonah Ridge, but here it is 

 broken by a fault that cuts out a considerable portion of the strata 

 between the upper part of the Mons and the Wonah quartzite. To 

 the northwest and southeast deep broad canyons lead up from Sinclair 

 Canyon to the encircling ridges which are largely covered by debris 

 and forest growth. 



The best horizon marker in the great amphitheater is W^onah 

 quartzite which occurs around the southwest upper slopes of Sinclair 

 Mountain and on the high ridge on the northeast side. (See fig. i, 

 pi. 4.) The quartzite is cut by the canyon east of a fault just 

 above bridge No. 5 on the Banff-Windermere motor road. At this 

 point it dips to the southwest 50° to 60° with the Silurian Beaver- 

 foot formation above and the Ordovician Sinclair formation beneath. 

 Passing down the canyon and up in the section the Silurian above 



^ Name given to the northwest ridge of Sinclair Mountain south of Sinclair 

 Pass, the southwest slope of which rises above Kootenay Park Warden Cabin 

 No. 2 on the Banfif-Windermere motor road. 



