3^4 
Frank Carney 
moraine which reaches across the sheet. Northwest of Groton 
this loop leads into a wide moraine the southern part of which 
may have been deposited when the ice extended a little farther 
south in the main valley; this drift blends continuously with 
deposits west and northwest. Where the highway leading east 
from West Groton crosses this drift it has a kame topography; 
for about a mile southward washed drift characterizes the belt. 
Crossing the slight valley of the brook which leads southeastward 
through Pleasant Valley to Peruville this moraine forms a low 
ridge or loop. Its continuation from this point is marked by the 
kame hills indicated in the irregularity of the 1400-foot contour 
line on the south wall of this valley. 
At Benson Corners this moraine shows a variety of development. 
North and a little west of the Corners it assumes a ridge-like 
form, the axes having a northwest-southeast trend; while south 
of the Corners the drift has a typical kame aspect. This kame 
topography continues in a southeast band to the headwaters of 
Mill Creek, where a conspicuous ridge of drift crosses the valley 
indicating an earlier halt of the ice which is farther defined by the 
outwash gravel spread to the southeast; this ridge rises on the 
south Wall of the valley to the 1280-foot contour, and the moraine, 
noted in line with a continuation of this ridge, crossing the higher 
area to the southwest, is another indication of this temporary 
position of the ice; drift of contemporaneous origin is found in the 
vicinity of the third south-leading highway, east of the southwest 
corner of the sheet. 
It is apparent that this moraine is complex in development 
because the ice was gradually retreating with temporary halts. 
The two temporary halts already mentioned represent the pro- 
trusion of ice into low upland valleys, namely. Mill Creek valley 
and that of the Pleasant valley stream. These two variations 
indicate slight time periods, preceding the more permanent posi- 
tion which caused the major development of this moraine, which 
correlates more nearly with the Groton loop. 
Returning, then, to the kame plexus south of Benson Corners, 
we note that this band of drift takes a direction to the southwest 
where it again has a very kame-like appearance (fig. 16), in the 
vicinity of the highway-crossing approximately one mile south- 
west of Benson Corners. Here the ice-front held an east-west 
course for about one-half a mile, continuing thence in a line 
