Massive Crystalline Rocks. 



117 



garnet, but also much triclinic felspar and apatite, and in these 

 two points approaching the soda-granite, — thus evincing a very 

 marked transition in its composition toward that of the soda- 

 granite. The first bed above it, lying in the granite, is similar 

 to the schist in its black mica and quartz, but contains very 

 little garnet ; but like the soda-granite, it contains much apatite 

 and more triclinic felspar than orthoclase. Still other parallel 

 beds are ^ indicated at higher levels ; one of them exists at the 

 top of the bluff, twenty-five to thirty yards above the upper bed 

 in the figure. 



The facts look toward the same conclusions as those from 

 section 1. 



Section 3 vv^as taken along a line about half a mile west of 

 Cruger's Station, commencing on the river at q (see map, p. 60), 

 in front of the most western of the brick^'ard sheds, and passing 

 r, a point north of the upper shed, to s. For a distance of about 

 500 feet from the shore, the rock is mica-schist ; next follows 

 soda-granite for about fifty feet ; then, very coarse diorite (the 

 hornblende crystals in some parts finger-like in size) for 90 to 

 300 feet ; then soda-granite again. At the shore the schist is nearly 

 evenly fissile ; 450 feet north, on the line of the section, it is like 

 the six feet square represented in Fig. 11. In the next fifty feet, 



Fig. II. 



the flexures are distinct, but half faded out or nearly obliterated ; 

 and this is the last step before the soda-granite, the once plastic 

 or fused rock, begins. 



After twenty-five feet of soda-granite the first (a) of the ranges of 

 "inclusions " appears ; it is on the side of the road which here leads 



