66 



The island at 22 consists of Coutchiching garneti- 

 ferous schists dipping at 20 to the northwest. By landing 

 at the north end, an excellent opportunity is afforded to 

 observe their attitude with respect to the Keewatin group 

 which underlies the island (23) immediately to the north. 



From 24 to 27 are exposures of a hornblende gabbro 

 showing phenocrysts of basic feldspar. The contacts 

 of this formation with the Keewatin are not conveniently 

 exposed on the shores of the lake. 



From here, the shore line is followed rather closely 

 in a northerly direction to 30. Apart from small areas of 

 Coutchiching at 28 and 29, the exposures consist chiefly 

 of Keewatin medium-grained, massive to schistose diorite. 

 At 30 the Coutchiching schists again pass beneath these. 



The lake is now crossed in an easterly direction to 

 31, where a landing is made to examine the excellent con- 

 tact breccia of Coutchiching and Algoman there exposed. 

 The inclusions of previously schistose Coutchiching 

 enclosed in the invading granite, as well as the apophyses 

 of the latter cutting the former may be noted. A small 

 area of nearly flat-lying mica schist between 31 and 32 

 represents a remnant of the roof of the batholith. At 

 32 a striking exposure showing horizontal jointing in the 

 granite may be seen from the boats. Just north of 1 

 another Keewatin-Coutchiching contact might be advan- 

 tageously examined, after which a return is made to the 

 station. 



ANNOTATED GUIDE (Bear's Pass to Winnipeg). 



Miles and From Bear's Pass station the railway runs 



Kilometres. , . i r i -rr- ■ 



along the western edge of the Keewatin syn- 

 clinal trough, described above, to 4, where it 

 enters the Coutchiching and pursues a course 

 across the latter nearly at right angles to the 

 anticlinal axis. The more or less flat-lying 

 Coutchiching beds in the cuts between mile- 

 posts 209 and 210, represent remnants of the 

 batholith roof. After crossing the narrows 

 northeast of Bear's Passage the railway passes 

 again into Keewatin, intruded by hornblende 

 gabbro. Leaving this, another Coutchiching 

 belt is crossed between mileposts 212-5 (342- 

 km.) and 214 (344-3 km.), beyond which the 



