234 



The ore is found in irregular veins traversing 

 an altered, now dolomitic greenstone containing 

 pyroxene and olivine. 



The silts forming occasional benches on the 

 shores of Kamloops lake are often seen to have 

 been crumpled by overriding ice which occupied 

 the valley during a tempoiary increase of 

 glacial activity in the late Pleistocene. 



Metres 



Section illustrating great crumpling of Glacial silts by advancing ice sheet 

 which deposited typical till on the silts. Locality 3 . 5 km. west of Cherry 

 Creek station. 



WESTERN PART OF THE BELT OF INTERIOR 

 PLATEAUS. 



(SAVONA TO LYTTON.) 

 BY 



Charles W. Drysdale. 



ESSENTIAL GEOLOGY. 



Introduction. 



That portion of the British Columbia Cordillera which 

 lies between the Columbia Mountain system on the east 

 and the Coast range on the west, is known as the Belt 

 of Interior Plateaus. It is with the section between Kam- 

 loops lake and Lytton, along the course of the Thompson 

 river which traverses this belt, that the following outline 

 of geology deals. 



The district was first examined geologically in 1877 by 

 G. M. Dawson [1] and again by him in a more detailed 



