BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 2, pp. 165-176 February 12, i89i 



NOTE ON THE GEOLOGICAL STRUCTURE OF THE 

 SELKIRK RANGE. 



BY GEORGE M. DAWSON, ASSrSTANT DIRECTOR OF THE GEOLOGICAL 

 SURVEY OF CANADA. 



{Read be/fore the Society December 29, 1890.) 



CONTENTS. 



Page. 



Introduction ^ 165 



General Features of the Cordillera 105 



Surveys in the Interior Plateau Region 166 



Geological Features of the Interior Plateau 167 



Stratigraphy 167 



The General Section 167 



The Shuswap Series 170 



The Nisconlith Series 170 



The Selkirk Series 171 



General Relations of the Cambrian 172 



Newer Rocks 174 



Structure .. 174 



Thickness 175 



Discussion 176 



Introduction. 



General Features of the Cordillera. — The Cordillera, or Rocky Mountain 

 region of the Pacific coast, for a length measured by seven degrees of lati- 

 tude in the southern part of the province of British Columbia, is narrower 

 than elsewhere, having in this part of its course a width not much exceeding 

 400 miles. The principal geographical features of this southern portion of 

 the Cordillera in British Columbia are now pretty well known, and the 

 general geological outlines have also been drawn in, so far as this can be 

 done from reconnoissance work. The districts which have been more closely 

 studied are few and limited in size. 



Enough is known to show that this part of the Cordillera offers a geolog- 

 ical problem of great complexity, such as to require for its solution, even 



XXV— Bull. Geol. Soc. Am., Vol. 2, 1890. (165) 



