49 



in the neighbourhood, and in his report are embodied the 

 results of the most recent work. 



PARTICULAR DESCRIPTION OF POINTS TO BE VISITED. 



Leaving the train at the station, a path is followed for 

 2-6 miles (4-2 km.) to Steeprock lake. At three-fifths of a 

 mile (1 km.) from the station the first rock exposures are 

 seen. They consist chiefly of Keewatin felsites, quartz- 

 porphyries, and their derived schists, with which are asso- 

 ciated, however, small lenses of a quartz conglomerate 

 which may be infolds of the base of the Seine series. Ex- 

 posures continue for about a mile (i-6 km.) farther, and 

 are mostly of Keewatin acidic and basic types, although 

 occasional small outcrops have a remarkably sedimentary 

 aspect. 



After embarking in the boats a straight course is taken 

 to Jackpine point. On the left-hand shore are hills of 

 Laurentian granite gneiss, while on the right Keewatin 

 felsites and felsite schists, cut by dykes of post-Keewatin 

 diabase, are exposed to view. At the north end of Falls 

 bay a high brown bluff, consisting chiefly of the brecciated 

 phase of the Steeprock limestone, stands out bcldly. 

 Just as Jackpine point is reached a glimpse of Steep falls 

 to the northeast may be obtained. 



Cross-section of the Keewatin and Steeprock Series 

 on the South Shore of Falls Bay. — In walking over this 

 section from west to east, the Keewatin rocks are first 

 noticed on Jackpine point where a schistose pyroclastic 

 is splendidly exposed. The fragments are of the same 

 material as the matrix, and although elongated in the 

 general direction of the cleavage are not schistose like it. 

 East of this are exposures of typical hornblende, chlorite, 

 and felsite schists. 



The basal conglomerate of the Steeprock series is well 

 exposed next on a glaciated surface which extends for 150 

 feet (46 m.) across the strike (N 40 W). It should be 

 noted that the pebbles are chiefly quartz and granite, with 

 a few smaller ones of Keewatin diabase and greenstone. 

 To the east of this is a brown calcareous schist with lenses, 

 at times a foot (0-32 m.) thick, of ferruginous limestone. 

 This is all of the western limb of the Steeprock limestone 

 that is exposed on the south shore, but it is believed that 

 35069—4 



