122 J. D. Dana—Phenomena of the Champlain Period. 
and then—re-enforced by tributaries from high hills to the 
northwest—followed the valley of the existing brook for three 
miles before reaching Mill River at Augurville. The descent in 
this distance is 25 feet a mile, while that of Mill River from 
the dam to the same point was only 10 feet a mile. The two 
AUGURMIELE: 
Kettle-holes at the mouth of Sluice-way Brook. 
flooded streams came together with velocities corresponding t 
these different slopes ; and the coarse gravel deposits at the place 
of junction, some of the stones a foot or more in diameter, are 
evidence of the violence of the sluice-way torrent. 
4. Facts bearing on the Origin of the Kettle-holes and the long 
channel-like depressions. 
1. The relations between the kettle-holes and the Beaver 
Pond and Pine Marsh depressions, above pointed out (as eX 
hibited on the map), make it almost certain that there was 
d of 
community in origin for the two if not unity in metho 
n. 
This community of origin as regards the two great depres: 
2. 
sions was, with hardly a doubt, unity in origin and meth ao 
