BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 17, pp. 329-376 July 31. 1906 



THE OKANAGAN" COMPOSITE BATHOLITH OF THE CASCADE 

 MOUNTAIN SYSTEM* 



BY REGINALD A. DALY 



(Read before the Society December 30, 1905) 



CONTENTS 



Page 



Introduction 330 



Geographical subdivision of the Cascade Mountain system 331 



Area covered by the Boundary Commission survey 331 



General description of the batholithic area and location and relative size 



of its units 333 



Unity of the Composite batholith 339 



Petrography of the Composite batholith 340 



In general 340 



Chopaka basic intrusives 340 



Ashnola gabbro 341 



Basic complex 342 



Osoyoos Granodiorite batholith 343 



Macroscopic and microscopic characteristics .• 343 



Dynamic and hydrothermal metamorphism of the granodiorite. . . . 344 



Remmel Granodiorite batholith 347 



Physical and mineralogic characteristics 347 



Metamorphism 347 



Interpretations of the Eastern and Western phase 348 



Kruger Alkaline body 349 



Characteristics 349 



Metamorphism 351 



Similkaineen Granite batholith 352 



General character and mineral constituents 352 



Contact basification 353 



Cathedral Granite batholith 354 



Character of the material 354 



Younger phase 355 



Park Granite stock 35G 



Geological relations 35G 



Resume of the geological history. 361 



Sequence of the eruptive rocks 362 



Nature of batholithic intrusions 365 



♦Published by permission of the Canadian Commissioner, International Boundary 

 Surveys. 



XXXI — Bull. Geol. Soc. Am., Vol. 17, 1905 (329) 



