THE 
AMERICAN 
JOURNAL OF SCIENCE, &c. 
GEOLOGY, MINERALOGY, TOPOGRAPHY, &c. 
~~ @Oe«:-- : 
Art. 1.—A Sketch of ihe Geology and Mineralogy of the 
western part of Massachusetts, anda 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 portion of the 
adjoining states, constitute the section of country, con- 
tained in the following sketch. For the geology, &c. of 
the counties of Hampden, Hampshire, and Franklin, which 
lie on the eastern side ef the county of Berkshire, the 
reader is referred to the excellent papers of the Rev. E. 
Hitchcock, in Vol. VI. of the American Journal of Science 
and Arts. ‘The accompanying map is designed as a con- 
tinuation of that of Mr. Hitchcock, across the county of 
Berkshire to the river Hudson. 
Along the adjoining portions of Berkshire and the above 
mentioned three counties, lies the range of mountains, 
which eommences at the northwest of West Rock, near 
New-Haven, Conn., and extends northwards, forming the 
Green Mountains* of Vermont. The Taconick range of 
* Our geographers have usually considered West Rock as the origin of 
this range of mountains. But West Rock is secondary greenstone, and is 
separated, according to the statement of Professor Eaton, geographically, 
as well as geologically, from this primitive range. The greenstone ex- 
tends from West Rock to Deerfield and Greenfield, in Massachusetts, on - 
Connecticut River.—See Rev. E. Hitchcock’s paper, Vol. I. No. 2, of this 
Journal, and Vol. VI. No. 1, page 44. 
Vou. VIII.—No. 1. 1 
