V-shaped ravine. A lobe of fine till extends
into the valley from the northeast and narrows the outlet.

Between the railroad and highway, which cross the northern end of the
swamp, is an irregular wooded eminence of rock, partly concealed by a
veneer of drift. Between this knoll and Shelter Rock are heavy
deposits of sand in the form of a short, broad terrace with lobes
which point into the Still River valley. A similar terrace is found to
the northwest on the opposite side of the valley.

At the northern end of Shelter Rock along the blind road leading to
the summit is a peninsula-like body of drift which contains huge
granite boulders mixed here and there with pockets of sand and gravel.
Stratified drift was found at the foot of the hill, and till overlying
it higher up. The more usual arrangement is boulder clay overlain by
modified drift, the first being laid down by the ice itself, the
second being deposited by streams from the melting glacier in its
retreat. Huge boulders, many ten feet or more in diameter, are strewn
over the northern slope of Shelter Rock.

DEPOSITS NORTHEAST OF DANBURY

North of the railroad, opposite Shelter Rock (fig. 6), is a most
interesting flat-topped ridge of drift which topographically is an
extension of the higher rock mass to the northwest. In this drift mass
are to be found in miniature a number of the forms characteristic of
glacial topography. The broad-topped gravel ridge slopes sharply on
the north into a flat-bottomed ravine which is evidently part of the
Still River lowland. This portion of the valley has been shut off by
drift deposits. The drainage has been so obstructed that the stream in
the ravine turns northeast away from its natural outlet. In the valley
of "X" brook (fig. 1) are terraces, esker-like lobes, and detached
mounds of stratified drift resting on a foundation of till.

Along the eastern border of the hill is to be seen the contact between
two forms of glacial deposits (Pl. IV, B). A mass of stratified drift
overlies a hummocky deposit of coarse till, but large boulders
occurring here and there on top of the stratified drift show that the
ice-laid and water-laid materials were not completely sorted. Boulders
seem to have been dropping out of the ice at the same time that gravel
was being deposited. Boulders of granite-gneiss eight feet or more in
diameter, carried by the ice from the hills to the north and
northeast, are strewn at the foot of the hill.