1880.] 465 [S tone 
al may have been contributed by the floes. Near Kenduskeag Vil- 
lage in the upper kame are found sand beds showing curved and con- 
torted lines of stratification which dip 50° and some layers 60° 
obliquely toward the centre of the kame. The appearance is as if 
here a floe grounded. In the upper kame the stratification is arched 
or combined with a tendency to dip lengthwise of the kame, showing 
the action of alternating currents in that direction. The evidence of 
the marine origin of the clays which overlie the kames is conclusive. 
Leda, Mya, Balanus and other genera have been found in the strati- 
fied and undisturbed clay which filled a low place in a kame, and 
directly on top of the ridge. 
MATERIALS OF THE KAMES. 
At the northern ends of the kames the sand and gravel is much 
less worn and rounded than farther south. Some instances of this 
are given in the descriptions of systems II, VIII and XXIX. 
When kames pass from a region of one kind of underlying Jock 
into another formation, there is a corresponding change in the mate- 
rials, as is shown very clearly in the description of system IX. The 
facts show that the drift in the kames was in general greater than or- 
dinary glacial drift. In other words, kame drift is glacial drift plus a 
variable amount of water drift. Occasionally we find large angular 
boulders overlying the kames, which probably tumbled down upon the 
kame from ice walls, as has been suggested by Mr. Upham. ‘These 
may not have been transported at all from the places where they fell. 
The materials of the kames differ much in fineness. In regions of 
slate and schistose rocks, the kames are usually composed of fine 
gravel or sand or small pebbles, while in granitic regions they contain 
many large pebbles and often present somewhat the appearance of 
moraines. ‘The fineness of materials is also greatly influenced by the 
slopes of the region traversed by the kame, as is shown in the descrip- 
tions of many of the systems. 
GENERAL CONCLUSIONS. 
The following conclusions in addition to those already stated ap- 
pear to be justified by the facts thus far observed in Maine. The 
writer believes that very much remains to be discovered as to that 
manifold problem, the behavior and history of the great ice-sheet of 
eastern North America, 
PROCEEDINGS B.8.N. H.—VOL XX. 30 JULY, 1881. 
