147 



way south of mileage 179. This conglomerate 

 occurs in place at mileage 179, where the strata 

 of the Cobalt series are almost horizontal, show- 

 ing a succession in ascending order of slate, 

 quartzite and conglomerate. 



Twenty-five chains north of mileage 180 the 

 Cobalt series is exposed, showing in ascending 

 order: slate conglomerate, two feet (0.6 m.) of 

 grey and red slate, 10 feet (3 m.) of coarse 

 boulder conglomerate. Just beyond, opposite 

 the north end of Twin lake, is a bluff of con- 

 glomerate and slate, on the west side of the 

 track, which is 140 feet (42.6 m.) high. A 

 splendid view of the pre-Cambrian peneplain 

 can be obtained from this bluff. North of Twin 

 lake Keewatin greenstones ag'ain occur, but rock 

 exposures become infrequent. 



Ellipsoidal basalt occurs north of mileage 

 188, and one-half mile southwest of mileage 190 

 there is a ridge of Keewatin basalt 300 feet 

 (91.4 m.) in elevation. 



205.27 m. Altitude 873 ft. (266 m.). (Matheson, the 



330.2 km. centre of a farming area, is on the Black river, 



a branch of the Abitibi river. McDougal's 

 chute is formed bv a barrier of later diabase 

 which intrudes basic, schistose Keewatin. The 

 greenstone is also cut bv a dike of grey 

 porphyry.) 



Eleven miles east of Matheson is the Munro 

 township gold area. Here narrow auriferous 

 quartz veins occur in the Temiskaming grey- 

 wacke and slate. 



218.03m. Altitude 022 ft. (281 m.). At Monteith is 



350.7 km. an Ontario Government experimental farm. 



222.03 m. Altitude 897 ft. (273.3 m.). Three and one- 

 357.2 km. half miles southwest of Kelso is the Alexo nickel 



mine, a mass of nickeliferous pyrrhotite, at the 

 contact of rhyolite and serpentine. One theory 

 suggests that the ore is the result of replace- 

 ment in the serpentine, while another suggests a 



