Acciiiiiuliition of I >rii nil I IIS. — f j>/itiiii. 34:5 
Near Clyde and Lyons a considerable proportion of thoni are pro- 
longed in ridges which rise with steep sides to sharply narrow 
crests, having lengths of two, three, or Several miles from north 
to south in parallelism Avith the glaeiation of the region. With 
these are many other drunilins having the typical lenticular con- 
tour, from which all gradations are seen to the prolonged sharp 
ridges. Another area of drumlins, occurring in less profusion 
and presenting only the lenticular form, lies between x\dams and 
Carthage, in Jefferson county, between the east end of lake On- 
tario and the Adirondacks.* 
In the drift-covered northern part of New Jerse}' drumlins are 
probably infrequent, only two examples being mentioned by Prof. 
R. D. Salisbury in his recent preliminary paper on the Pleisto- 
cene formations of that state, t 
No drumlins have been found in Ohio, Indiana, and Illinois, 
by Mr. Frank Leverett, Prof . (1. F. Wright, and others, who have 
thoroughly examined that area, mapping its terminal moraines 
and other drift deposits. 
Next northwestward, however, drumlins are again encountered in 
great abundance and variety in the east part of Wisconsin. Professor 
Chamberlin, describing these and other till accumulations and the 
known areas of drumlins, in his address as vice president of Section 
E of the American Association in 1SS6, wrote as follows: 
Somewhat allied to the true moraines are the special forms of ag- 
gregation of the subglacial debris, or — interpretation aside — of the 
great sheets of till. Tiiey present a richness of variety and of inter- 
gradation that almost defy classification. The list of forms embraces 
(</) till tumuli; {h) manimillary and lenticular liills ; (c) elongated 
parallel ridges trending with the ice movement; ('/) drift billows akin 
to the above but without individual symmetry or discernible parallel- 
ism of axes or definite arrangement, giving a smoothly undulatory 
contour to the surface ; ('O-crag and tail; (./') precrag and combings ; 
((/) veneered hills, and a great i-esidual congeries of irregular emboss- 
ments and unclassifiable till liills. The most remarkable are the 
mammillary, lenticular, and elongated ridges, now frequently included 
ujider the term drumlins, vvliich have become sulqects of special in- 
quiry. These have a fine devel()j)ment in southern New Hampshire, 
central and eastern Massachusetts, northeastern Connecticut and 
Nova Scotia, in all of which the elliptical or lenticular varieties pre- 
\-ail. They liave a still more remarkable development in central New 
*l'>ulletin, (teol. Sue. of America, vol. iii, 1892, p. 142. 
■Kleol. Survey of N. J., Ariiiiuil iJi-porl for 1S91. p. 74. . 
