a <—<—<“_ 
Se 
eo 
— *-* © 
, Peneallen 
Hitchcock, in Vol. VI. of the American Journal ‘of Besant 
THE 
AMERICAN 
JOURNAL OF SCIENCE, &c. 
GEOLOGY, MINERALOGY, TOPOGRAPHY, &e. 
Arr, L—4 Sketch f the Geology and Mineralogy of the 
‘western part of Massachusetts, and a small part of the 
adjoining States; by Professor Cuzster Dewey, of 
Williams College. 
| Communicated to the Lyceum of Natural History of the Berkshire Medi- 
cal Institution, and, with additions, forwarded to the Editor of this 
Journal. | 
Tue county of Berkshire, and a small cor wi on 
adjoining states, constitute the section of cou 
tained in the following sketch. For the geology hg "of 
the counties of Hampden, a | ranklin, which 
lie on the eastern side of the co nee a7 
and Arts. The accompanying map is designed as a con- 
tinuation of that of Mr. Hitchcock, across the county of 
Berkshire to the river Hud 
son. 
Along the adjoining portions of Berkshire and the above 
New-Haven, Conn., and extends northwards, forming the 
n Mountains* of Vermont. The Taconick range of 
* Our geographers have usually considered West Rock as the origin of 
this ra — of 7 ag But West Rock is secondary greenstone, and is 
ted, according Bvad statement of Professor Eaton, geographically, 
las po ste Me y; from sagt d ter range. The greenstone ex- 
prdity ye West Rock to Deerfield and Greenfield, in Massachusetts, on 
Connecticut River.—See Rev. Hitchcock’s paper, Vol. I. No. 2, of this 
jowree and Vol. VI. No. 1, page 44. 
L. VILI.—No. 1. 1 
