382 E. Hitchcock on the Metamorphism of 
from one of the specimens obtained at this locality. Looking at one of 
these edges, we should have no hesitation in referring the rock to a highly 
quartzose variety of talcose schist. But looking at the other edge, we 
should have no doubt that the quartz laminw are merely flattened and 
elongated pebbles, So strange and unexpected a fact leads the geologist 
to suspect that he may be deceived; but hundreds of specimens force 
him to the conclusion that he is not mistaken. 
The quartz in this rock, both in Wallingford and Plymouth is gener- 
ally white, or a light gray, and though sometimes granular, it approaches 
much nearer the hyaline variety, in most instances. It seems to be quite 
pure silex, rather than a silicate. In a few instances we find pebbles of 
anite, which are also flattened. 
The suggestion has been made that what I regard as pebbles 
may be concretions. But the following facts seem to me to show 
this position to be untenable. 1. We have no other example of 
concretions formed of hyaline or granular quartz. 2. Concretions 
are never, as these nodules are, drawn out into the lamin of 
tric structure. 4. Some of them consist of granite, gneiss, &c., 
which certainly never form concretions. 5. If these nodules are 
much different from east and west of each other, leads to some 
interesting suggestions and conclusions. The distance between 
these two points is about ten and a half miles. 
Myself and son, aided by the Senior Class of 1861, in Amherst Col- 
lege, have recently, (October, 1860), traversed this line, mostly on foot, 
and obt e result, the section below, fig. 10. The base of the 
section is the sea level, and the heights are laid off from the same scale, 
(about 13,000 feet to the inch), as the horizontal distance. This makes 
the Green mountains, (1390 feet above the ocean at Mt. Holly), appear 
of very diminutive size. But it is a true representation, except that the 
mountain for the sake of distinctness is a little too high. On both the 
flanks of the mountain, the dips are quite distinct, (they were measured 
83 
