1898] Ells — Formations, etc., of Ottawa District. 187 



The principal folds which afifect the strata near Ottawa can 

 be readily recognized. They occur both to the east and west 

 of the city. Near Rochester street, on the line of the Canada 

 Atlantic railway, one of these is seen to the north of the track, 

 which disturbs the regular dip of the limestone to some extenb 

 but affects only the strata of the Trenton, as these limestones 

 continue west as far as the road south from Hintonburg. On 

 the line of the Ottawa and Parry Sound railway, however, a 

 short distance west of this road, there are several breaks in the 

 strata, the dips increasing suddenly from five to sixty degrees. 

 The first of these affects merely the Trenton limestones, but a 

 second disturbance, a lew yards further west, is more pronounced 

 and brings the Trenton abruptly against the Elack River lime- 

 stones. The vertical extent of this fault cannot however be 

 very great. It is however, of interest, from the fact that it can 

 be traced for some miles both to the north and south. Thus if 

 prolonged on a course of south twenty degrees east, magnetic, 

 it will reach the faulted area at the Hog's Back, where however, 

 several other breaks are seen, while on the other hand if traced 

 northward, it can be recognized in the several streets of Hinton- 

 bujg, and Mechanicsville, from which it can be followed across 

 the Ottawa, through Tetreauville and out to Fairy Lake, the 

 line connecting all these points being quite straight. At all 

 these points the Trenton is brought into contact with the Black 

 River. At Tetreauville, several other minor faults can be easily 

 seen in the area between the Aylmer road and the river, some 

 of which affect the Trenton beds ouly, as is the case v/ith the 

 disturbance along the post road into Hull at the pitch of the 

 hill near Tetreauville. This disturbance can also be seen on the 

 line of the Electric railway near the junction of the tracks to 

 south of this village. 



The portion of the Ottawa River between the fo6t of the 

 Little Chaudiere rapids and the railway bridge shows a consider- 

 able breadth of disturbed strata. The broken character of the 

 Trenton beds in this direction can be readily recognized among 



