About a mile beyond Beaver Brook Mountain, the railroad cuts through
the edge of a hill 80 feet in height exposing a section consisting of
distinctly stratified layers of fine white quartz sand, coarser
yellowish sand, and small round pebbles. The quartz sand was used at
one time in making glass. Farther east where the two tracks of the New
York and New England railroads converge, a cut shows a section of at
least 40 feet of boulder clay. Near the river, limestone boulders are
common, indicating that the valley to the north was degraded to some
extent by the glacier.
[Illustration: ~State Geol. Nat. Hist. Survey Bull. 30. Plate V.~
A. Kames in Still River Valley west of Brookfield Junction.
B. Till ridges on the western border of Still River Valley, south
of Brookfield.]
In the valley at Brookfield Junction and on its western side, are
thick deposits of clean sand. One mile north of Brookfield Junction,
along the western border of the valley, an esker follows an irregular
course for several hundred yards approximately parallel to the river
and terminates at its southern end in a group of kames (Pl. V, A and
B). Opposite the point where these accumulations occur, is a
terrace-like deposit of till. Between the gorge at Brookfield and the
mouth of Still River, swampy areas, flat meadows, and small hills of
drift occur.
In comparison with the Still River lowland, the flat land east of
Green Mountain may be called a plateau. The step between the two is
made by an east-facing rocky slope, the outline of which has been
softened by a lateral moraine separated from the plateau edge by a
small ravine. On the lowland below the moraine is a group of kames.
Near Lanesville (fig. 6), are thick deposits of water-laid material,
including a hill of gravel near the river having a large bowl-shaped
depression on one side formed by the melting of an ice block. Two and
a half miles south of Lanesville on the west side of the lowland, a
wooded esker extends for about one-quarter mile parallel to the valley
axis and then merges into the rocky hillside.