206 J. D. Dana— Geological Relations of the 
ward, in the course of which it becomes increasingly stauro- 
litic and garnetiferous, and passes in places into a true gneiss, 
it comes to its end against soda-granite and quartz-dioryte. 
Thus within a breadth of only 250 to 350 yards, there is here a 
passage from a stratum of crystalline limestone through con- 
formable schists, to the massive rocks along which we have to 
look for contact-phenomena. 
The facts here described are mostly from three south-to- 
north sections: Section 1, 800 to 400 yards west of the Station 
(1 to n, on the map); section 2, about 700 yards (p); section 3, 
about 900 yards (g tos). 
n section 1, 2 to m is the schist ; at m is soda granite, which 
becomes hornblendic twenty-five feet above, toward the road ; 
and then at n, on the north side of the road, the rock is of 
coarse quartz-dioryte. (The'locality n is that of the first out- 
crop of rocks on the road going northwest from the railroad 
station.) The contact-phenomena in this section are as follows. 
_ In the first place, the mica schist is even in bedding against 
the limestone ; becomes more and more contorted to the north- 
ward, or away from it; and is full of flexures of a yard or so 
in span for the last fifty feet or more south of the junction with 
the granite. ; 
‘With the increase in the flexures of the layers, the schist 
becomes interlaminated with nodose-lines of quartz, vein-like 
in origin; and, besides, the garnets become somewhat larger. 
At the junction referred to, the schist is mostly a garnet rock 
containing much fibrolite and staurolite, and the latter is in 
some places granular-massive inasmall way. Just below the 
granite, the layers are a compact body of flexures, and in the 
itr there is another flexed layer rather faintly indi- 
cated. 
Figure 9 represents the condition here described ; it was 
taken from the west side of a little bluff at m; the height 
is twenty feet. The dotted portion is that of the soda-granite. 
The garnet rock of the flexures under the granite contains, 
like the granite, soda-lime (or triclinic) feldspars, with little 
orthoclase ; and the first foot of the granite is strongly garnet- 
iferous ;—facts which show a degree of transition in the mate- 
rial of the tworocks. The flexed bed within the soda-granite 
is gneissoid in character and of darker gray color than the 
granite; it is quartzose and garnetiferous, strongly micaceous 
with black mica, and contains magnetite and a little staurolite. 
The schist is consequently not a schistose portion of the gran- 
ite, but a distinct bed ; it is like the schist in its minerals, but 
in its more gneissic character indicates that it is intermediate 
between the schist and the soda-granite. The eastern face of 
the same ledge is about a dozen feet to the east of the western, 
