AMERICAN 
JOURNAL OF SCIENCE AND ARTS. 
[THIRD SERIES] 
+ 
Art. LIL—On Southern New England during the melting of the 
Great Glacier ; by James D. Dana. No. IV.* 
IV. Depression oF THE LAND, OR AMOUNT OF SUBSEQUENT 
ELEVATION, 
THE higher of the terraces of stratified drift, especially of 
those along the shores of estuaries and tidal inlets, or within 
the lower tidal part of the river valleys, are rightly regarded as 
evidence, after making the necessary deductions, of the amount of 
upward change of level which the region containing them has 
undergone. he following are some heights above high-water 
or flood level observed in Southern New England : 
1. The terrace plain, or upper level of the stratified drift, in 
the northeast corner of the New Haven plain, near Whitneyville 
~—50 feet; and in the northwest corner, at Westville—47 feet. 
2. On the Housatonic River near Birmingham, ten miles 
from the Sound and nine miles west of New Haven—95 feet. 
In the Connecticut valley, in the vicinity of Middletown, 
about thirty miles from the Sound and twenty-three miles 
northeast of New Haven—150 feet. 
4. At the head of the fiord called the River Thames, at Nor- 
Wich, sixteen miles from the Sound and nearly fifty miles north 
of east of New Haven—110 feet. 
5. At the head of Narragansett Bay, about Providence, a 
mile above the mouth of Providence River, and about 100 
miles north of east of New Haven—80 feet. 
Here we have terraces at five places in Southern New. Eng- 
land, thirty miles or less from the Sound, and within reach of 
* For the preceding parts of this memoir see pp. 168, 280, 353, of this volume. 
Am. Jour. 8c1.—Turrp Serres, Vou. X, No. 60,—Dec., 1875. 
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