4i 

 Miles and occur of both the magnetite and hematite types. 



Kilometres, r^. ., -, r ,■ , • _, • 



lhe gramte-Keewatin contact is crossed just 

 west of Kashaboiwe, and the greyish-white 

 granitic hills are a prominent topographic fea- 

 ture from this point to near Huronian. 

 97-1 m. Huronian. — The next 25 miles (40 km.) to 

 156-2 km. Kawene station afford an excellent opportunity 

 to observe the intrusive relations between an 

 Archaean granite-gneiss and a distinctly sedi- 

 mentary series. Sufficient detailed work has 

 not yet been done in this part of the region to 

 definitely correlate these rocks, but, in all prob- 

 ability, they are the Algoman granite and the 

 Seine sedimentary series, which will be examined 

 in detail at Iron Spur. An excellently developed 

 contact breccia continues with abundant ex- 

 posures for the whole distance, and may be 

 readily observed in a general way while en route. 

 121 • 6 m. Kawene. — At Kawene the contact swings south 

 195-7 km. of the track, and from here to mile post 126 

 excellent exposures of the Seine series occur on 

 both sides. At this mile post, the contact is 

 again crossed, and the Algoman granite con- 

 tinues to Iron Spur. 

 123-8 m. Iron Spur — Altitude 1,400 ft. (427 m.) From 

 206-4 km. this point a trip is taken three miles (4-8 km.) 

 along a spur line to the site of the Atikokan iron 

 mine to observe the irruptive contact between 

 the Algoman granite and the Seine series, and 

 to examine the high-sulphur iron ore-body. 



GEOLOGY OF THE VICINITY OF IRON SPUR. 



General Statement. 



The general elevation of the country surrounding 

 Iron Spur is between 1,300 and 1,500 feet (396 and 457 m.) 

 above sea-level, or from 700 to 900 feet (214 to 275 m.) 

 above Lake Superior. The outstanding features of the 

 physiography are the low rounded hills that characterize 

 the Pre-Cambrian in this part of Canada. The intervening 

 areas consist occasionally of glacial drift, but more usually 

 of alluvial material, forming what are commonly known as 

 muskegs. 



