GENERAL DESCRIPTION OF BATHOLITHIO AREA 



335 



The subordinate geological members (excluding dikes) within the bath- 

 olithic area are eight in number. 



The largest of these consists of apparently Paleozoic schists, quartzites, 

 greenstones, and other rocks forming the ends of two tongues that enter 

 the belt respectively from north and south (see figure 3). These rocks 

 occur on the roughly tabular "Kruger mountain," and for present pur- 

 poses may be called the Kruger schists. The two schist tongues adjoin 

 the Osoyoos batholith and nearly cut it off completely from direct contact 

 with other plutonic units in the belt. 



Complex of Palaeozoic schists 

 and basic intrusives 



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Figure 3. — Ground Plan showing Relations of the Osoyoos, Similkameen, and Kruger 

 igneous Bodies and the invaded Paleozoic Formations. 



Scale, 1 : 110,000. 



Between the Kruger schists and the Similkameen batholith is a com- 

 paratively small area of highly composite intrusives belonging to the 

 malignite and nepheline-syenite families (see figure 3). These crop out 

 on the western summits of the Kruger Mountain plateau and may be 

 referred to as the Kruger Alkaline body. 



The ' Similkameen granite preserves what seem to be remnants of its 

 once complete roof (see figure 4). Chopaka mountain is crowned with 

 a large patch of schist very similar to the Kruger schist. This Chopaka 

 schist is cut by a strong body of gabbro apparently transitional into pure 

 olivine rock — the Chopaka Basic intrusives. The whole forms a huge 



