356 R. A. DALY — THE OKAftAGAN COMPOSITE BATHOLITH 



the two rocks are closely welded together, and it seems probable that the 

 coarser granite was still hot when the younger granite was injected. 



PARK GRANITE STOCK 



The Park Granite stock measures 4 miles in length by 2y 2 miles in 

 width (figure 6). This granite is coarse, unsqueezed, and in almost all 

 respects resembles macroscopically the Older phase of the Cathedral bath- 

 olith, of which the Park granite seems to be a satellite. Under the micro- 

 scope the rock differs from the coarser Cathedral granite chiefly in the 

 entire replacement of microperthite by orthoclase; so that this granite is 

 a normal biotite granite rather than a soda granite. The greater homo- 

 geneity of the dominant feldspar may explain the fact that the Park 

 granite is somewhat more resistant to the weather than the Older phase of 

 the Cathedral batholith. A few prisms of dark green hornblende are 

 accessory in much the same proportion as in the Younger phase of the 

 Cathedral. With these exceptions, both essential and accessory constit- 

 uents are, in individual properties and in relative amounts, practically 

 identical in the type specimens of stock and the Older phase of the bath- 

 olith. The specific gravity of the Park granite is 2.673. 



A second, very small boss of the Park granite occurs within the mass of 

 the Eemmel batholith some 5 miles west-southwest of the Park Granite 

 stock. This boss is circular in plan and measures not more than 250 

 yards in diameter. 



Geological Relations 



The Okanagan mountains are among the most accessible in the whole 

 trans-Cordilleran section along the 49th parallel. Even without a trail, 

 horses can be taken to almost any point in the 5-mile belt. Owing partly 

 to mere altitude, partly to the general climatic conditions, the summits 

 are often well above the timber line, while the mountain flanks are clad 

 with the woods of beautiful park lands. Another special advantage in 

 determining geological relations consists in the freshness of the rocks, 

 which have been heavily glaciated and have not been seriously injured by 

 secular decay. With a little searching, excellent and often remarkably 

 perfect exposures of every formation and of its more important contacts 

 can usually be discovered. Each of the principal field relations now to 

 be noted has been determined not from one contact alone, but through the 

 accordant testimony of several favorable localities. 



The oldest rocks within the batholithic area are the Kruger schists, 

 with their associated basic intrusives, and the roof pendants of the Simil- 

 kameen batholith (figures 2, 3, 4, 5, and 6). Without doubt these rocks 



