Upham.] 
230 
[April 17, 
Fragments of Shells in the Till near Boston,” Proc. of this Society, 
vol. xxiv, 1888, pp. 127-141. 
G. F. Matthew, in “Report on the Superficial Geology of New 
Brunswick,” Geol Survey of Canada, Report of Progress for 1877- 
78, p. 12 EE. 
G. H. Stone, in Proc. of this Society, vol. xx, 1880, p. 434 ; 
Proc. of the Portland Society of Natural History, Nov. 21, 1881. 
L. Johnson, “ The Parallel Drift Hills of western New York,” 
Trans. N. Y. Acad, of Sci., vol. i, 1882, pp. 78-80 ; Annals do., 
vol. ii, 1882, pp. 249-266, with map. 
J. D. Dana, in Am. Jour. Sci., Ill, xxvi, 1883, pp. 357-361, re- 
lating to Round Hill, in Orange, Conn., near New Haven. 
T. C. Chamberlin, Geology of Wisconsin, vol. i, 1883, p. 283 ; 
Third Annual Report of the U. S. Geol. Survey, 1883, p. 306 ; 
Proc. Am. Assoc, for Adv. of Sci., vol. xxxv, 1886, p. 204. 
Nearly all of the many sections of drumlins observed by me in 
New Hampshire and Massachusetts consist, as these hills are de- 
scribed by others in various parts of our own glaciated area and in 
the British Isles, simply of the unstratified glacial drift, called till 
or boulder-clay, deposited directly by the ice-sheet, with no inter- 
calated thick beds or even thin seams or veins of modified drift, as 
gravel, sand, or clay, assorted and deposited in a stratified condi- 
tion by water. Last autumn, however, I found on the east shore 
of Scituate, Mass., about twenty-five miles southeast from Boston, 
two extraordinary drumlins, known as the Third and Fourth Cliffs, 
which consist of till upon their whole surface and to a depth that 
varies from 15 to 25 feet and more, but below include beds of mod- 
ified drift that attain in Third Cliff a thickness of at least 30 to 
40 feet, reaching to the boulder-strewn shore, and in Fourth Cliff 
a thickness 10 to 20 feet, being seen there to be underlain by till 
and to be also in part interbedded with it. 
Proceeding southward from the entrance of Scituate Harbor, the 
First and Second Cliffs are passed in less than a mile (fig. 1). 
These are gently sloping drumlins, with gracefully rounded, nearly 
flat tops, which are elevated respectively about 30 and 45 feet 
above the sea. The eastern third of each has been eroded by the 
Atlantic, and the resulting steep sections appear to be till through- 
out, from the natural surface to the shore formed of the boulders 
which have been left in this process of erosion and are piled in a 
moderate slope to a height about ten feet above mean tide, the dif- 
