*891.] 
233 
Upham.J 
near Dover ; Great and Country ponds in Kingston ; Otternic 
pond, in Hudson ; and Pollard and Cragin ponds in Greenfield. 1 
In my survey of the modified drift of the Connecticut river valley 
in New Hampshire and Vermont, a very interesting small basin 
of this kind was found in Thetford, Vt., on the high terrace plain 
of fine silt close to the river and 142 feet above it, having an area 
of only about two acres but a depth of 40 feet as determined by 
sounding. 2 
In Massachusetts, besides Walden and Cochituate, hundreds 
of other ponds and lakes enclosed at least in part by modified 
drift are shown on the map of the state recently prepared by 
Prof. N. S. Shaler and his assistants, for theU. S. Geological 
Survey, on which the various drift formations are distinguished 
by separate colors. The following are of this character : Kimball’s 
pond, in Amesbury and Merrimac ; Johnson’s pond, Groveland ; 
Pentucket pond, Georgetown ; Wenham lake, in Wenham and 
Beverly ; Suntaug lake, in Peabody and Lynnfield ; Haggett’s and 
Foster’s ponds, Andover ; Martin’s pond, North Reading ; Quan- 
napowitt lake, Wakefield ; Horn Pond, Woburn ; Mystic lake, in 
Medford and Arlington ; Fresh pond, in Cambridge and Belmont ; 
Jamaica pond, Boston ; Billington Sea, West pond, Beaver Dam, 
Long, Halfway, and White Island ponds, Plymouth, and indeed a 
large majority of the total ,365 ponds, which can be counted, ac- 
cording to popular belief, in Plymouth township ; a similar propor- 
tion of the many ponds in Barnstable county, which comprises the 
peninsula of Cape Cod ; the ponds of the morainic belt on Nan 
tucket, and part of those belonging to this belt on Martha’s Vine- 
yard ; Tyng’s pond, Tyngsborough ; Newfield and Hart ponds, 
Chelmsford ; Fort Meadow reservoir, Marlborough ; West Wash- 
accum pond, Sterling; Lake Quinsigamond, in Worcester and 
Shrewsbury; North pond, Worcester; and Wachusett pond, in 
Princeton and Westminster. 
In the city of Providence, R. I., as I am informed by Mr. J. 
B. Woodworth, Randall’s and Leonard’s ponds on the north, and 
Long, Benedict, Mashapaug and Spectacle ponds on the south, 
belong to this class. 
In Minnesota basins of modified drift are occupied by White 
Bear, Bald Eagle, Oneka, and Forest lakes, lying 10 to 25 miles 
1 Geology of N. H.vol., iii, 1878, chapter, i, pp. 97, 109, 116, 128, 144-6, 150, 156, 161 , 
2 Ibid., p. 36. 
