If Still River occupies the valley of a reversed stream, the following
physiographic features should be expected:
1. A valley with a continuous width corresponding to the size of the
ancient stream, or a valley comparatively narrow at the north and
broadening toward the south.
2. Tributary valleys pointing upstream with respect to the present
river.
3. The regional slope not in accord with the present course of the
river.
4. Extensive glacial filling and ponded waters in the region of the
present sources of Still River.
5. Strong glacial scouring at the northern end in default of a glacial
dam at the southern end of the valley, or to assist a dam in its work
of reversing the river. The evidence of glacial erosion would be a
U-shaped valley, overdeepening of the main valley, and tributaries
ungraded with respect to the main stream.