53 



Brecciated Limestone at Elbow Point. — From True- 

 man point a direct return trip is made to the northwest 

 end of Elbow point, where a breccia made up of angular 

 fragments of limestone, black chert, and Keewatin felsite 

 and greenstone, cemented together by crystalline limestone 

 is well exposed. Interbedded with this are layers of a 

 more or less pure limestone. As pointed out above, these 

 brecciated phases are chiefly exposed at the sharp bends 

 in the shore-line. 



After examining this locality, the return journey is 

 made to Atikokan. 



ANNOTATED GUIDE. 



(Atikokan to Mine Centre). 

 Miles and Beyond Atikokan the railway proceeds in a 



Kilometres. 



general way down the valleys of the Atikokan 

 and Seine rivers for 35 miles (56-4 km.). The 

 Seine series- Keewatin unconformity, with the 

 younger series on the south side, follows with 

 minor irregularities the bed of Seine river almost 

 as far west as Mayflower. Occasional exposures 

 of the Seine series are seen along the railway, 

 except in two small stretches from mile posts 

 147 to 149, and from 159 to 161, where the 

 contact swings south of the railway, and parts 

 of the Keewatin belt are crossed. 

 i6o-om. Banning — Altitude 1,256 ft. (383 m.). In 

 257-8 km. this vicinity, diamond-drilling for iron ores has 

 been carried on recently, but the results have 

 not been highly satisfactory. The outcrops, 

 which are of a hard iron formation in associa- 

 tion with Keewatin greenstones, lie close to 

 the railway and constitute probably part of 

 the western extension of the Atikokan iron 

 range. 



After passing mile post 161, splendid expo- 

 sures of the Seine schists and slates may be 

 seen in the cuts on both sides of the railway 

 as far west as Mayflower. 

 164-7 m. At this point a stop of about fifteen minutes 

 264-9 km. is made to examine a case of post-glacial faulting 

 (8) in the Seine series. The exposure is just 



