35 



drift, mostly boulder clay, and few rock sections are 

 exposed . 



Mile 225. — Kathlyn lake, a shallow sheet of water 

 about a mile in diameter occupies a depression in the 

 boulder clay. To the west are three prominent peaks of 

 the Hudson Bay mountains separated by deep valleys 

 filled in their upper reaches with ice. 



Southeast of Kathlyn lake, the railway follows a 

 boulder clay plain separated from the river by a low ridge. 



Mile 230. — At this point the railway rejoins the 

 Bulkley river, which it follows to Telkwa. The Bulkley 

 here winds through a wide secondary valley sunk through 

 the drift and bottomed with large alluvial flats. 



Mile 235-51.— Telkwa.— The Telkwa river, a swift 

 turbid glacial stream, here joins the clear Bulkley. Both 

 streams approach their point of junction through short 

 canyons, having sunk their channels through the drift 

 into a low rock plateau, probably a ridge in the floor of the 

 old valley. 



Sections of the bluish grey, felspathic sandstones and 

 carbonaceous shales of the Hazelton group are exposed 

 along the canyons. 



Telkwa the terminal point of the excursion is situated 

 east of the Bulkley river opposite the mouth of the Telkwa 

 river. 



34883— 3* 



