Geology and Mineralogy of a part of Massachusetts, &c. 3 
highest in this section, 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 not 
to be expected that they can be delineated with perfect ac- 
curacy on the accompanying map. While the eastern part 
of the section lies upon 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 county of 
Berkshire, because the rocks were different. Even small 
hills are often put down, because they show the alternations 
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. 
These are Granite, 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 slight resemblance to the prominences of a saddle, from which this 
mountain received its name, depends upon the form and position of the 
principal peaks. The same peaks, however, are not seen in the different 
positions from which this mountain is viewed. This mountain is errone- 
ously called Saddleback on the map of mountains, published at Boston, 
1820. Saddleback is a mountain in England, 
