J. D. Dana—The flood from the melting Glacier. 177 
half way to North Haven; and this is demonstration that their 
existence depends not on the kind of deposits there let fall by 
the glacier, but on the quiet condition of the waters. There is 
also proof at Quinnipiac, as brought to my attention by Mr. S. P. 
Crafts, that the depositions took place before the ice had all 
melted ; for a large bowlder—four feet in diameter—has been 
taken out of the clay from a depth of six feet, and some inter- 
calations of gravel seem to have had a similar origin. At the 
same place, fifty feet to the west of the clay pit, a very coarse, 
stony stratum of stratified drift overlies the clayey stratum ; 
the fact that the latter exists below the stony beds having been 
ascertained by Mr. Crafts by means of a drill, which descended 
through and brought up some of the underlying clay. This 
overlying stony bed was made by violent currents that suc- 
ceeded to the still waters of the place, and these violently flow- 
ing waters were probably those of the great flood. 
3. Evidence as to the flood in its denudation of the stratified drift 
deposits.— Along the west side of Mill River, where the beds are 
stony and of the coarsest kind, the plain is 10 feet below the 
usual level, the height not exceeding 30 feet above the river 
flats: while on the west side of the river near the State street 
bridge, where the stony beds are less coarse, the height is 40 to 
42 feet—the full height of the New Haven plain in that latitude. 
The lower level on the west side continues south to the harbor, 
valley, (on the map between BI and West River). The follow- 
Am. Jour. Sc1.—Tuimp — Vou. X, No. 57.—Sept., 1875. 
