412 | Geology of Deerfield, &e. 
from different elevations. The boundaries of the several 
formations have not been so carefully noticed near the angles 
of the map as in the central parts. Of their correctness, gene- 
rally, however, I am confident. The latitude. and longitude 
of Deerfield, from which those on the map were marked, 
were obtained by taking a mean of the observations given by 
Gen. E. Hoyt, in the Transactions of the American Academy 
of Arts and Sciences, and of twelve lunar observations since 
made. The result is, Lat. 42° $2’ $2”. Long. 72° 39° from 
Greenwich. 
With the map is given a view of the strata of rocks from 
Hoosack mountain to eleven miles east of Connecticut river, 
on a line nearly east and west, passing through Deerfield. 
The horizontal distances are laid down from a scale; the ele- 
vations are assumed. The principal rocks only are coloured; 
for itis very difficult to determine the breadth of many, since 
they frequently alternate with one another. I have not ex- 
amined the country on the east side of Connecticut river with 
sufficient care to be able to extend the section on that side 
more than a few miles. 
It may not be amiss to mention, that Mount Holyoke, 
much celebrated for the delightful view from its top, has been 
found, with a sextant, to be 830 feet above Connecticut river 
Its height has been frequently overrated. : 
The mineralogy of this section of the country has been bat 
imperfectly explored. I shall mention those minerals only of 
which I have obtained specimens, and whose localities have 
not been noticed by mineralogists. 
Quartz—several varieties. 
1. Rock Crystal—abundant. Some good specimens are found 
in Conway, on feldspar, with the usual hexagonal, pri 
matic crystals, and these crystals cross each othet in 
all directions. at 
2, Trised Quartz—found in Leyden. 
3. Granular Quartz—in Deerfield. 
4, Radiated Quartz—in Whately and Shelburne. ' 
5. Blue Quartz—in rolled masses on the banks of Deerfield 
river. 
