146 Jaks Jos IRA CIEH GLO 
series of hills and knolls having a general direction of S. 30° W. 
with a low valley between holding the five ponds. (See Fig. 4.) 
The heavier group lies on the east side of the valley, extending 
between two north and south roads a distance of about two and 
one-half miles, with a breadth of three-fourths of a mile. The 
western group lies between the ponds and a north and south 
road and is only about one-third the area of the eastern group. 
The southern limits are not definite but shade into the silt-cov- 
ered drumloids. 
Southward, past Mendon Center, the general contour of the 
surface is drumloidal, but there seems to be a deposit of silt or 
sand over the surface and filling the hollows. This area of silt 
is indefinite and is intersected by the excavation of the Honeoye 
~ creek valley. Beyond this excavation a sand plain forms a con- 
spicuous level, locally known as the ‘‘ Mendon plains.” This 
lies southwest of Rochester Junction on the Lehigh Valley Rail- 
road and extends to Sheldon Corners. 
Eskers.—Through the midst of the eastern high track there 
winds an esker ridge. This is not conspicuous, but from some 
points of view the knolls blend so as to form a very evident 
eskemine, (See lai, G.) 
One mile south of the kame area occurs a singular group of 
knolls that must be regarded as an esker. This lies one-half 
mile south of Mud pond and three-fourths of a mile west of 
Mendon Center. The north end of the esker is cut by the east 
and west highway. This esker consists of four connected knolls, 
ina north and south line, making altogether a length of about 
one-eighth of a mile. The local name of the knolls is the 
“Dumpling hills.” The summits and slopes of the ridge and 
the road cutting show only a fine, stiff or silty sand, similar to 
much of the surface of the region southward. A few stones 
were observed in the sand. The esker is thirty to fifty feet high 
but surmounting a ridge, probably drumloid, it is conspicuous 
over considerable area. Its altitude is 762 feet (aneroid). The 
sides of the esker are very steep and ridges of sand stretch away 
from it at right angles. 
