; 
ROCKY MOUNTAINS—KOOTANIE PASS. 61 

hundred feet, and from their exceedingly bright colour, they constitute 
wherever they occur, an excellent reference horizon, and may often be 
detected even at a great distance. They are hard, red, thin-bedded sand- 
stones, with frequent thin intercalations of red argillaceous material, and 
one or two beds of small thickness, composed of pale-greenish, shaly 
quartzite. A fifth subdivision which intervenes in some places between 
the red beds and the base of the limestone above, is not well seen in this 
part of the valley. 
. 127. Five miles westward in the pass, the valley forks, one branch 
taking a north-westward direction, the other running west-south-west. 
The trail also divides here; one track, which does not appear to be much 
used, taking the former, while the other takes the latter direction, and in 
doing so, follows the main stream of the brook. The north-western 
valley was not examined in detail, but the mountains surrounding’ it 
afforded from a distance, a fine general section of the rocks from Series 
C. upward. | 
128. In following the main valley, after crossing the brook, the trail 
for about half a mile runs parallel with the axis of a gentle anticlinal 
which has an east and west course, and passes eventually into the 
mountanious point which separates the two vallies. In the bed of the 
brook, and well down among the variegated sandstones and quartzites of 
subdivisions 1 or 3 of Series C., isan extensive exposure of diorite. It 
appears to be intercalated between the beds, but is probably intrusive, as 
it was not elsewhere seen. Over twenty feet in thickness is exposed. 
The rock is so traversed by fissures as to render it almost impossible to 
break off a clean-faced specimen, and is dark coloured and compact. 
Some large fragments found in the brook, which appear to have been 
derived from the same bed, show remarkable stellar aggregations, several 
inches in diameter, of pale green felspar crystals. Below the diorite, and 
in the bed of the brook, an extensive series of banded red and green 
sandstones and quartzites, with occasional white quartzite layers, 
appears. The beds are not inclined at high angles, or much disturbed, 
but are somewhat corrugated on a small scale. A species of slate con- 
glomerate* is also not uncommon, though not generally occurring in beds 
more than a few feet in thickness. The rock so designated, is generally 
a greenish or white quartzite, enclosing small irregular fragments of 
* Though the name slate conglomerate best describes the constitution of this rock, it differs much in 
appearance, and probably also in origin, from the Huronian slate conglomerates, ($ 104.) 

