184. J. D. Dana—The Flood of the Connecticut River Valley 
measurements of Professor Edward Hitchcock, and for the Spring- 
field region, the survey of the Springfield Cit Engineer, as in a 
former paper.* I have personally made alge in Holyoke, 
Willimansett, and South Hadley. It was my purpose to have 
made pre gather in the State, but fing cea "Pr ofessor 
B. K. Em , of Amherst College, was engaged in a thorough 
study ‘st thugs g of the terraces, I gladly left the subject in 
his hands. 
The height of the very extensive upper terrace of wester 
Northfield, the town adjoining New Hampshire, I have ‘eked 
from Mr. Upham, his map covering this Northern Massachusetts 
town; he gives it at 198 to 213 feet above low water in the river. 
Although the terrace borders most obviously the Connecticut 
valley, he speaks of it as a tributary’s — , and takes for the 
The true upper terrace extends to Gill; aids corresponding one 
on the eastern side of the Connecticut, ‘put little lower, continues 
with small interruptions all the way to Miller’s Falls. 
For the height of low water level in the paabteozie Valley, 
between Holyoke, in Massachusetts, and Hartford, Connecticut, 
I have used the section made in connection wish: the very exa 
yoke has not yet been acetates determined. In the section, the 
height at the top of T s Falls | is made 180 feet, and at the 
foot of the rapids, 120 fee 
n the Connecticut part "of the section, the paar are, with one 
D kon om my own levelings. y former measurements 
have been repeated, in order to be able to ete the heights to 
mean-tide level, and others have been made. 
e extensive terrace east of the Co nnecticut, which com- 
mences 8 miles north of Springfield and has a w width in Massachu- 
seldom rises to the level of maximum flood. Just south of 
Thomson, this upper plain appears about the isolated Enfield 
ridge, at a height of 214 4 feet. Two miles west of the Connec- 
ticut, peiec opposite the — place, it has full height, 215 feet, 
about the isolated ri ridge of Suffield village. The material is 
coarse gravel. A northern portion of the Suffield ridge is 10 feet 
higher and is of coarse cobblestone material, and may be till. 
Northwest of Hartford, the upper terrace is well ‘defined half 
* Southern ie — during the melting of the Great Glacier, this Journal 
Til, x and xi, 187 
+ Annu ual Lagat of ‘chs Chief of — for 1878, nck B14. Report 
of the surveys and examinations o e Connecticut River between rg 
Conn., an oke, Mass., made = 1867, by Brevet-Major General G _K. 
Warren, Major of Engineers, U.S. A 
* 
2 
