432 
Frank Carney 
ing in the opposite direction on the Dryden sheet. The plentiful 
bowlders, as well as the suggestion of a channel toward the north- 
ern margin of the flat area, both indicate ice-front drainage. In 
some places it is evident that the drift has been quite completely 
swept away; this is particularly true in the crease which is indica- 
tive of a channel, cut by the narrower, more permanent form of 
the overflow stream. 
(2) West Groton is situated on the northwest corner of a 
quadrangle formed by highways. Just south of the diagonally 
opposite corner from West Groton is a channel which lies slightly 
north of the axis of the valley leading southeastward to the village 
of Pleasant Valley. This channel dissects a loop of drift already 
described. It is a well marked crease, though it does not disclose 
the underlying rock. 
(3) Beaver Brook, a tributary of Fall Creek, heads in a channel 
southeast of Lafayette. The channel here indicates a long period 
of overflowing glacial waters. The lateral tongue of ice from the 
lobe that persisted in Fall Creek valley stood for a considerable 
period in this valley, the drainage from which incised the over- 
flow channel referred to. 
(4) Another tributary valley of Fall Creek valley, leading south- 
east from the parallel of Rogers Corners, also was similarly occu- 
pied by a lateral tongue of ice, the drainage from which developed 
a channel leading into Dry Creek of the Cortland quadrangle. 
Fig. 12 gives an idea of the morainic accumulations built up 
during this halt of the ice. 
(5) Again the tributary valley east of Como caused an analogous 
arrangement of drift and overflow channel. This channel like- 
wise carried waters into a valley of the Cortland quadrangle. 
(6) Leading eastward from the plexus of drift in which Fall 
Creek rises is a channel of glacial overflow incised in the rock, and 
leading into Skaneateles Inlet valley. This channel has already 
been alluded to under the discussion of drainage (p. 343). To 
some extent its development may be of post-glacial origin. The 
manner in which the drift north and west from the western ter- 
minus of the rock gorge portion of this channel has been eroded 
indicates that the post-glacial factor in its degradation is very 
unimportant. 
(7) In connection with the formation of the drift loop just east 
of North Summer Hill the ice-front waters developed a channel 
