40 



Lorraine shales up to a point within a few rods of Kent 

 House at Montmorency Falls. The highway is lined on 

 both sides with the quaint houses of the French Canadians 

 whose long, narrow farms extend to the river on one side 

 and to the Laurentian hills on the other. 



MONTMORENCY FALLS: (a) CREST OF FALLS, WESTERN SIDE.* 



From this point one gets a good general view of the 

 locality. The crest of the fall is 274 feet (83.5 m.) above 

 sea level ,and the look-out point, on top of the building 

 by the dam, is about 320 feet (97.5 m.) — A.T. In the 

 bed of the river is Pre-Cambrian gneiss, and across 

 the stream, the Trenton limestone is seen resting unconform- 

 ably upon the gneiss, but with a dip conforming to the 

 slope of the surface of the older rock. Below the falls is 

 a great thickness (700 feet or 215 m.) of thin-bedded, 

 micaceous shale of Lower Lorraine (Frankfort) age, and 

 beneath it, 200 feet (60 m.) of black Utica shale. These 

 shales instead of being nearly horizontal like the limestones 

 above the falls, dip to the southeast at an angle of about 

 40 . The face of the fall is on a fault plane, and the top 

 of the Trenton, at the base of the fall, is 270 feet (82 .3 m.) 

 below the base of the Trenton at the top of the fall, thus 

 indicating a drop to the south of about 600 feet(i8o m.) 

 All along the western bank of the stream may be seen the 

 thin-bedded Trenton limestone, which is quite fossiliferous, 

 both near the look-out and at the western end of the road 

 bridge above. The fauna is that of the Trinucleus zone, 

 in the lower part of the Trenton. 



Across the north channel of the St. Lawrence lies the 

 Island of Orleans, and the low area on the nearer side of 

 that island is composed of graptolite-bearing strata of the 

 Quebec City formation, having about the same strike and 

 dip as the Lorraine on this side of the river, thus implying 

 the existence of a thrust in the bed of the St. Lawrence. 



MONTMORENCY FALLS: (b) CREST OF FALLS, EASTERN SIDE. 



While crossing the bridge above the falls, the ridges of 

 gneiss on the eastern side of the river, both above and 

 below the bridge should be noted. These ridges show the 



*See Map : — Montmorency Falls. 



