174. = J. D. Dana—The flood from the melting Glacier. 
at top quite to the Mill River channel, and were all one in simul- 
taneous origin. 
ow the flow of the Quinnipiac waters must have undergone 
some change before the last twenty feet of sand and gravel a 
laid down, and it must have been a change in volume and v 
lence. Owing to this change the current in the river ae so 
powerful as to overcome the action of the i incoming tide and 
take charge itself of the deposition of the earth and gravel. In 
other words, an extraordinary flood set in, extraordinary even 
at a time when a violent flood had been already long in prog- 
ress; and the flood waters did the deposition even in the face’ 
of the tide. 
Similar evidence of the flood should exist in the other_val- 
leys of the region. I have observed it in the valley of Wil- 
Section of stratified Drift up Wilmot Brook. 
Owing to there being no good sections of the stratified drift 
at the extremities of the Mill River and West River valleys, 
I have not obtained any facts from these points. 
2. Evidence as tv the flood in gravelly and stony formations. —The 
material of the stratified drift-formation over a large part of the 
ew Haven region is sand, with only small pebbles where any 
occur. But adjoining the river courses through the plain, espe- 
cially Mill River and West River, it consists to a great extent 
of large pebbles or stones, and much of it of cobble-stones, 
many of which are six to eight inches in diameter. 
Quinnipiac Valley deposits are an exception, because 
“s wide Moni was at the time an interior harbor nearly four 
miles long and a mile in average width, with North Haven at 
its head, and much of it was over 50 feet deep. It was hence 
