63 



coloured, fine grained, quartzose sandstone. At the 

 beginning of the section, the sandstone beds are thin, in 

 most cases from 5 to 15 inches (10 mm. to 40 mm.) thick, 

 while farther down stream, the sandstone beds bulk more 

 largely and in places are 6 feet (2 m.) thick. The strata in 

 general dip upstream at comparatively low angles, but in 

 places, are crenulated. 



The general character of division 2 and its relations 

 with the remaining divisions, may be seen to advantage in 

 the walls of the gorge of the river below the falls. The 

 route to the foot of the falls passes northward through 

 the town and thence by a side street joining a winding 

 road leading down into the gorge of the river. No exposures 

 occur in this part of the town, but presumably it is under- 

 lain by strata of division 2. The winding road, leading 

 from the town street, first runs southerly towards a low 

 escarpment whose bare rock face is formed of nearly 

 horizontal dark shales with beds of light coloured sand- 

 stone. These measures belong to division 2. They repose 

 on strata of division 3, but are separated from them by a 

 nearly horizontal thrust plane which must lie about at 

 the foot of the escarpment. 



At the first bend in the road, in front of the escarpment, 

 and again a short distance farther on, are outcrops of a 

 light coloured, greenish-grey, quartzose sandstone dipping 

 to the southeast, towards the escarpment, at an angle of 

 about 30 . This sandstone belongs to division 4, and in 

 the exposureless interval between its outcrops and the 

 face of the escarpment, must lie the strata of division 3. 



The strata of division 3 are displayed along the road 

 from a point near the second exposure of sandstone, to near 

 the end of the road at the river side. In the first expo- 

 sures, the strata dip southwards at angles of about 45 . 

 The rocks consist of dark shales with thin sandstone beds 

 \ to \\ inches (10 mm. to 40 mm.) thick. As the road is 

 descended, there may be seen in the high rock escarp- 

 ment the trace of a thrust plane along which the strata 

 of division 2, have been pushed over those of division 3. 

 The fault plane dips towards the south at an angle of 

 about 20 . The overlying strata of division 2, are nearly 

 horizontal, the underlying strata (division 3), are steeply 

 inclined and, in the neighborhood of the fault, are crumpled 

 and torn. 



