i6i 



Miles and 

 Kilometres 



662-5 m. 

 1,066 km. 

 "District 

 D." 



213-5 m. 

 343 km. 

 699 m. 

 1,125 km. 

 "District 

 D." 173 m 

 278 km. 

 722 m. 

 1,162 km. 

 "District 

 D." 



153-5 m. 

 246-9 km. 



769 m. 

 1,398 km. 

 "District 

 D." 

 103 m. 

 165 km. 



Three miles (4-8 km.) west of Hearst, grey, 

 biotite-gneiss cut by dykes of light coloured, 

 biotite-muscovite-pegmatite is exposed in a 

 rock cut along the railway. The folia don of 

 the gneiss strikes N. 35° E. The rock surface 

 has been greatly polished by the continental 

 glaciers, the direction of the ice movement, as 

 indicated by the striae, being S. 30° E. 



The southern limit of the broad belt of Palseo- 

 zoic sediments which lie to the south and west 

 of Hudson bay, occurs just 15 miles (24-2 km.) 

 north of this point. 



Missinaibi river.— Laurentian gneiss is ex- 

 posed at the crossing of the Missinaibi, which is 

 one of the largest tributaries of Moose river and 

 for two centuries the principal route used by 

 the employees of the Hudson's Bay Company in 

 travelling from Lak- Superior to Hudson Bay. 



Kapukasing river— Kapukasing river is 

 crossed at a waterfall formed by a barrier of 

 mica-hornblende-gneiss which the river has 

 encountered in cutting through the overlying 

 drift. 



Ground Hog river.— Laurentian gneiss also 

 occurs at the crossing of Ground Hog river. 

 On the east side of this river the stratified clay 

 laid_ down in lake Ojibway can be seen in 

 section. Between Ground Hog and Mattagami 

 rivers there are several exposures of Laurentian 

 gneiss. 



At mileage 730 (1,175 km.) a dyke of fresh 

 diabase intrudes the Laurentian. 



Cochrane— Altitude 915 ft. (278 •6m.). Coch- 

 rane IS the present terminus of the Timiskaming 

 and Northern Ontario railway and a divisional 

 point on the National Transcontinental. It is 

 also the centre of an agricultural district which 

 is being taken up rapidly by settlers. 



The Pre- Cambrian bed rock is not exposed at 

 Cochrane but glacial deposits and a number of 

 clear water kettle lakes may be seen. 



36425—1 1 



