DETAILS OF SECTIONS. 21 



western extremity is very near the place where an old river bed, about a mile 

 long, unites with the present bed. I do not feel much confidence in the accuracy 

 of the heights, since they were taken by the aneroid barometer. For the view of 

 the terraces on which this village stands, accompanying this paper (Plate IX, Fig. 

 2), I am indebted to Mr. Franklin P. Chapin, who took it with his pentagraphic 

 delineator from the east side of the river. 



21. This section extends from the present bed of Westfield river over the hill on 

 its west bank, and across the old river bed referred to in the last paragraph. The 

 heights were obtained by the aneroid barometer; and, therefore, are liable to some 

 uncertainty. 



Many other terraces are shown along Westfield river on Plate VII, with three 

 old river beds to be described in my paper on erosions. The heights of the terraces 

 I have not measured, and therefore do not give sections of them. 



3. In the Basin extending from Mettawampe to the Month of Miller s River. 



22. This basin, though small, has many terraces, but none of them seem to me 

 of special interest. I have measured only one section in it, and not the highest 

 terrace upon that ; as it lies at a distance from those which were measured. I 

 commenced on the narrow alluvial plat just above Turner's Falls, on the Montague 

 shore, and ascended the sandy hill that lies southeasterly. This was reached as 

 the third terrace; and, except along its eastern margin, it constitutes the general 

 surface of the basin. At its southern part, in the south part of Montague, I judge 

 the surface to be higher than on the section, as is usually the case near gorges. 



4. Sections in the Basin extending from the Mouth of Miller's River to Brattleborough. 



I ought to repeat here, and make more general, a remark elsewhere made, that 

 the upper terraces usually extend more or less from one basin into another ; that 

 is, these higher terraces were formed when the waters extended from one basin 

 into another, and what now seem to have been barriers, were then only narrower 

 places in the estuary. On the east side of the river, in this case, terrace No. 4, 

 and perhaps No. 3, on Map No. 1, Plate III, were continued into Northfield from 

 the basin next south. 



23. This is in Northfield, two miles south of the village, running eastward from 

 Connecticut river. The fourth terrace, or beach more properly, is irregular on its 

 top, and was not measured. 



24. This runs from the same river eastward in the north part of Northfield, only 

 a short distance south of the State line. 



25. At the mouth of Ashuelot river, in Hinsdale, the terraces are numerous 

 and instructive. This river is a small but rapid stream, and where it debouches 

 from the hills into the Connecticut valley, it has brought forward a large mass of 

 terrace materials,- mainly of gravel, which originally constituted a delta terrace ; 

 that is, the stream threw forward these materials into the lake, or estuary, and 

 formed a bank along its mouth. But as the waters drained off, so as to bring this 



