562 



dip than that just mentioned. It is probable that these beds 

 continue eastward and form much of the sunken area in that 

 direction. 



At the south-eastern portion of the foot hills of the 

 mount the faulting has been somewhat complex and has led 

 to the breaking up of the purple-slates series into large) 

 angular blocks. Three main fault-planes appear to be in- 

 cluded in this system of fractures. One, having a strike north 

 and south — parallel with the mount; another, with a strike 

 east and west — transverse to the southern end of the mount ; 

 and a third, parallel to the last, but with a strike at right 

 angles to the south-eastern slopes of the mount. By the 

 last-mentioned fault the beds of the purple-slates series have 

 been brought in, like a wedge, between the main quartzite 

 of the mount on the one side, and the limestone series on the 

 other. This fault apparently intersects the Mount Creek a 

 little to the southward of the most westerly bend of the 

 creek, where the latter cuts through the main quartzite, as 

 described above. The evidences for this conclusion rest on 

 the sudden change of outcrops from typical siliceous lime- 

 stones on the one side, and equally typical slates and 

 quartzites of : the purple-slates series on the other, as described 

 next below. 



At the next bend to the eastward (up-stream from the 

 great westerly bend) the creek cuts through a very strong 

 purplish-coloured quartzite that dips S. 20° W. at 84°. This 

 rock has at one time formed an imposing waterfall, as the 

 stream now runs througji a narrow gap, with precipitous walls 

 250 feet in height. The stream has almost done its work in 

 this respect, having cut down the stony barrier at its up- 

 stream limits to within a few feet of the normal grade, but 

 there is still sufficient left to preserve the name of "the 

 waterfall." This quartzite has all the features of the 

 purple-slate series — its divergent strike, purple colour, black 

 lines of sedimentation, and associated calcareous sandstones — 

 leaving little doubt as to its true geological horizon. 



The outcrop of this quartzite was followed along its 

 eastward strike. It occupies the northern banks of a small 

 valley that unites with the Mount Creek (just above the 

 waterfall) and follows the ridge to the valley head, passes 

 over the parting into the headwaters of the chief tributary 

 that drains into Campbell Creek, over the next ridge, curving 

 a little to the south, crosses another small creek to the south- 

 ward, and intersects the bridle-path that goes to the south 

 end of the mount. In its progress it splits up into several 

 beds of quartzites, which are separated by slates. The beds, 

 whilst not brecciated (as occurs in the case of the siliceous 



