576 



Sections of the mash-rock can be seen in the creek a little 

 below the Cathedral Rock. 



The crush-rock crosses the Mount Creek a little above 

 the main limestone, where very massive blocks of triturated 

 siliceous limestones occur on the banks, and continue up the 

 rise on the opposite side. The same rock features extend 

 higher up the creek on both sides, the greater crush having 

 occurred within the curve made by the siliceous limestones in 

 their return strike to the mount, and are in evidence almost 

 to the extreme southern end of the range, covering an area 

 of about two' and a half miles in a north and south direction, 

 and one mile on the east and west diameter. 



In this area, as in the northern, there are evidences of 

 on extensive field of fracture, which makes geological map- 

 ping, except after prolonged and detailed work in the field, 

 extremely difficult. The longitudinal fault which exists on 

 the south-eastern side of the mount is not so much a single 

 line of displacement, but a wide zone that is filled by 

 mashed rocks derived chiefly from slates. This fault zone 

 narrows as it approaches the southern end of the mount, and 

 becomes reduced to a disturbed area a few feet in width, 

 impregnated with iron oxides. Between this zone of mashed 

 rock, near to the base of the mount, and the main limestone 

 that runs parallel with Campbell Creek, there is an extensive 

 area of the earthy and siliceous limestones and slates which, 

 while preserving the form of stratification, is for the most- 

 part, in the condition of a crush-breccia. The strike of the 

 beds is very divergent at different points, producing a cor- 

 responding variation in the direction of dip. The main lime- 

 stone which outcrops on the eastern side of this disturbed 

 area is not materially affected in the same way, although it is to 

 some extent shattered along its western borders. 



An important transverse fault can be recognized where 

 the siliceous-limestone series abut against the purple-slates 

 series just below the waterfall in the Mount Creek, mentioned 

 above. Although this fault makes a feature on the eastern 

 side of the mount, it stands related to the great east and west 

 fault at the southern end of the mount, and will be referred 

 to under that heading. 



5. The Great Fault at the Southern End of the Mount. 



At the southern end of the mount we meet with another 

 of the major faults that has helped to determine the outline 

 of the main ridge. The fault-plane has a strike 35° N. of 

 W., which cuts off the limestone series on both sides of the 

 mount, as well as the glacial till, in addition to the quartzite 



