Geology and Mineralogy of apart of Massachusetts, &c. 8 
highest in this oon, and in Massachusetts, is Saddle* 
Mountain, between Williamstown and Adams. See the 
Geology of Williamstown and vicinity, in Vol. I. of this 
Journal. 
The map of this section is copied, with some alterations, 
from different maps of this part of the United States. Few 
Mountains, however, are delineated upon these maps, and 
the mountains of this section are very inaccurately laid 
down on any map yet published. Though much pains have 
been taken to get accurate views of the mountains, it is no 
to be expected that they can be delineated with perfect ac- 
curacy on the accompanying map. While the eastern part 
ion li a range of hills, only the general 
ranges have been attempted to be given, because the rocks 
so nearly resemble each other. More efforts have been 
made along the middle and western part of the sous of 
Berkshire, because the rocks were different. Even small 
hills are often put down, because they:show the "thaiadlicken 
of the rocks, or the projection of one rock in the midst of 
others. The different coloring shows the general course 
and places of the different rocks. In the two counties of 
New-York, fewer hills are depicted, because their relative 
situation was less observed, and because they have less ele- 
vation, and less diversity of rocks. 
__ Principal Rocks. 
SP ene 
These are Crane Gneiss, Mica- -Slate, Granular Lime- 
stone, Argillaceous Slate, Quartz Rock, Transition Lime- 
stone, and Gray Wacke. Mica-slate is far the most abundant 
rock in Berkshire county, and in the counties in Vermont 
and Connecticut, directly north and south ; and it forms the 
principal rock along the eastern boundary of Berkshire in 
_ the three adjoining counties. 
- The — ae to the prominences of : — from seg this 
mountain name, depends upon the form and posi of the 
principal peal he same peaks, however, are net een nin The di different 
positions ate Shick this mountain is viewed. This mountain is errone- 
ously called Saddleback on the map of mountains, published at Boston 
1820. kis a mountain in England. 
