Pleistocene Geology of Moravia Quadrangle 
395 
Between the first mentioned highways the esker attains a sharp 
and typical development. No other on the sheet displays such a 
continuity of even meanders; but from the point of division the 
ridges are lower and more flattened. The eastern of these two 
divisions breaks up shortly into distributaries which lead into a 
low flat area of sandy soil, the development of which is hardly 
ample to warrant the designation ‘^sand plain.” While the 
division turning south is typically developed in a few segments, 
in the main its appearance is indicative of a subglacial stream 
which had already disposed of most of its load. 
As indicated above, the first half-m^ile of the esker is without a 
break. The brook which it parallels, however, then cuts across 
the esker, taking advantage evidently of a low place in the ridge. 
Just before reaching this breach in the ridge, in walking along 
the esker from the northeast, one observes on the west side a 
tributary ridge not many rods long but attaining considerable 
height near the place of junction with the main esker. So far as 
may be determined from the surface, in the absence of fresh sec- 
tions, the material of this esker is prevailingly fine. 
No. 3 (fig. i8). There is considerable obscurity as to the termini 
of this esker. Kame moraine practically hems the esker in except 
for a portion of its southern side, and either end of the esker 
appears to be buried or to be interfered with by the agencies con- 
nected genetically with this marked kame development. 
The ridge in places approximates fifty feet in altitude, and has 
steep slopes. Some complexity of the subglacial drainage here is 
suggested by a tributary ridge from the south towards the eastern 
end of the esker. As exposed in the railroad cut the esker is rather 
coarse in structure, indicating the vigor of the subglacial stream. 
It is felt that in an esker of the proportions evidenced by this there 
should be a typical development of sand plain. The fact, how- 
ever, that in all parts of the valley, save where the kame topog- 
raphy abounds, outwash material has leveled up to some extent 
the natural inequalities tends to obliterate the sand plain structure 
that may have existed; furthermore this absence of the finer 
assorted deposits that would indicate a static body of water is 
evidence that when the esker stream was active the front of the 
ice had retreated, allowing the drainage of Dryden valley to flow 
westward, thus terminating the lake stage. 
A feature worthy of note in connection with this esker is the 
