Umpog-Saugatuck divide to Bethel. North of Bethel, the drainage seems
to have been gathered chiefly in streams flowing on each side of the
low ridge occupying the center of the valley; consequently the gravel
was deposited along the sides and southern end of the ridge and in the
sag which cuts across its northern end. The row of kames at the north
end of Umpog Swamp, several knolls of drift in Bethel, and the
kame-like deposits and esker north of Grassy Plain were laid down
successively as the ice retreated down the valley. During this period,
the drainage was ponded between the ice front and the Umpog-Saugatuck
divide.

Uncovering the Still-Croton valley did not give the glacial drainage
any lower outlet than the Umpog-Saugatuck divide afforded (fig. 8, B
and C.)

The heavy deposits of boulder clay forming the moraine which blocks
the Rocky River valley indicate the next halting place of the glacier.
In this period the ice margin formed an irregular northeast-southwest
line about a mile north of Danbury. The country west and south of
Danbury was thus uncovered, but the lower part of Still River valley
was either covered by the ice sheet or occupied by an ice lobe. The
drainage was, therefore, up the river valley, and being concentrated
along the valley sides resulted in the accumulation of sand and gravel
at the foot of rocky slopes. It is possible that an ice lobe extended
down the old Rocky River valley, perhaps occupying much of the country
between Beaver Brook Mountain and the high ridge west of the valley.
The streams issuing from this part of the ice front would have laid
down the eskers and kame gravels north of Danbury and the thick mantle
of drift over which Still River flows through the city. As would be
expected, this accumulation of material ponded all the north-flowing
streams--Umpog Creek, Beaver Brook, and smaller nameless ones--and at
the same time pushed Still River, at its mouth, to the southern side
of its valley. Beaver Brook valley, Umpog valley, and all the Danbury
basin must have been flooded during this period up to the height of
the "railroad divide." Within the area covered by the city, the valley
was filled up to at least 70 feet and probably much more than that
above its former level. Flowing at this higher level, the river was
thrown out of its course and here and there superimposed on hard
rock--as, for example, at Shelter Rock.

That part of the drainage coming down the valley opposi