36 



than a foot in thickness, but near the Canadian Pacific 

 Railway track there is an exposure several feet in thick- 

 ness. 



Returning to the city an excellent view of Mt. McKay 

 may be seen from the Lookout near the collegiate building. 

 By reference to the accompanying section the effect of 

 the diabase sills upon the form of the mountain may be 

 observed. The Lookout itself is interesting in that it 

 is built of materials representing most of the Pre-Cambrian 

 rocks of the region. An outcrop of black Animikie slates 

 occurs near the corner of Prospect Street and the car 

 line, and at the corner of Hebert and College Streets is a 

 good exposure of taconite. Slates and Keweenawan trap 

 are well exposed in the Stewart and Hewitson's quarries 

 at the end of Hill street, and in the former, slaty cleavage 

 is well developed. Silver was found in a vein in this quarry. 

 The large quarry near the crushing plant shows several 

 well defined veins, filled with calcite, fluorite and barite, 

 which penetrate both slates and diabase. 



Bibliography. 



1. Logan, W. E Rep. of Progress, G.S.C., 1846-47, 



pp. 1-46. 



2 Geology of Canada, Rep of Pro- 

 gress, G.S.C., 1863, with Atlas 



3. Bell, R Rep. of Progress, G.S.C., 1866-99, 



PP- 3I3-364- 



4. Ingall, E. D Ann. Rep. G.S.C., Vol. Ill, Pt. F, 



1887-88 



5. Miller, W.G Ont. Bur. Mines, Vol. XVI, Pt. II, 



pp. 150-156. 



6. Bowen, N.L Ont. Bur. Mines, Vol. XX, Pt.I, 



pp. 1 19-132. 



7. Lawson, A.C Geol. and Nat. Hist. Surv. of 



Minnesota, Bull. No. 8. 



8. Smith, W. N Ont. Bur. Mines, Vol. XIV, Pt. I, 



P- 257. 



9. Silver, L. P Ont. Bur. Mines, Vol. XV, Pt. I. 



