J. D. Dana—Age of the Green Mountains. 195 
dromica schist extends through the State on the east side of 
the mountain section, much like that on the west side; more- 
over, near the northern boundary of the State the two join and 
are one, showing thereby the closest relation between them. 
The eastern belt contains to the south some small beds of 
) 
metamorphic as we proceed southward from the Canada line. 
Kast of this eastern band of hydromica schist there is a band 
called clay slate, having parallel relations to that which exists 
in the western section (Taconic belt). Farther east, there are in 
the northern two-thirds of the State (besides some local granite 
areas), a north-and-south belt of mica schist (“Calciferous mica 
schist”), with some gneiss, and, beyond this, another of argillyte, 
with a small band of true hydromica schist in some parts near 
the Connecticut. ; 
Ill. Taz Centrrat Mountain Bett. 
t f 
schist,+ and specimens of the latter gathered by the writer 
from the summit are not distinguishable from those of the 
600) of the Green Mountain gneiss ‘in Massachusetts, it was called 
mica schist because of the scarcity of feldspar in it. So here and in many parts 
he Green Mountains, it might be appropriately called feldspathic mica schist. 
+ Vermont Report, 507-509. 
Vermont Report, p. 523; Adams’s Report, 1845. 0. H. Hitchcock says 
