208 J. D. Dana—Geological Relations of the 
soda-granite, and then, after a few yards of this rock, the 
dioryte or hornblende rock, which is indicated in the diagram 
by short lines instead of dots. About a yard above the schist, 
within the mass of the granite, a schistose layer, about a foot 
thick, occurs; and eight to nine feet above this another in the 
dioryte, and both are conformable to the schist. 
he upper bed of schist shows (in thin slices) that it is a 
quartzose, dark gray gneiss, containing much black mica and 
garnet, but also much triclinic feldspar 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 feldspar 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 |. 
Section 3 was taken along a line about half a mile west of 
Cruger’s Station, commencing on the river at q (see map, p- 
195) in front of the most western of the brickyard sheds, 
and passing 7, a point north of the upper shed, to s. Fora dis- 
tance of about 500 feet from the shore, the rock is mica schist ; 
next follows soda-granite for about fifty feet; then, very coarse 
dioryte (the hornblende crystals in some parts finger-like in 
size) for 90 to 100 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, the flexures are distinct but half faded 
out or nearly obliterated ; ang 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 up the slope. Between three and four yards 
of the band are represented in figure 12. As shown, it is in 
pieces; yet the pieces are not much displaced, which they 
would be in an erupted rock. The material is grayish-black, 
and consists of a very chloritic magnetite, with a little black 
