during the melting of the Glacier. 417 
depth up stream for the next mile and a half; and for the next 
three-fourths of a mile, or up to Augurville, the height is 45 
feet. Toward Mt. Carmel village the height diminishes to 36 
feet above flood level; and then in the next half mile above to 
25 feet.* 
C. Quinnipiac River.—The terrace plain along the Quinni- 
piac near where it leaves its valley, or at the Air Line Railroad 
cut, is 48 feet. North of this lie the wide marshy flats, which 
continue for five miles to North Haven; and at the latter place 
the height of the terrace on the west of the river is but 45 
On the other hand, if the Glacial flood were vast enough to 
raise the waters to that level and: so to build up (out of the 
sands and gravel within its disposal) the drift formation there 
existing, without any aid from an elevation of the land, or of one 
of sg 5 to 10 feet, then, when the flood had passed, the streams 
would have sunk their beds to their present level, and so have 
left the terrace-plain, where not more or less washed away, at its 
present height above them. 
_ Thus either hypothesis, (1) that of an elevation of 45 feet 
since the Champlain period, or (2) that of the accumulation of 
stratified drift in the valleys to its present height by the Glacial 
ood, with little or no subsequent elevation of the land, will 
explain the facts. If the former were the actual condition, then 
the waters would have continued their work, about the estu- 
later or “ Alluvian” part of the Champlain period, beyond’ a 
height of 5 to 10 feet above high tide level, should be looked 
Tr. : 
For further evidence we proceed now to facts from the struc- 
ture of the beds of arathed drift, and from the occurrence of 
* This diminution in the depth of the cut, or in the height of the terrace-plain, to 
only AE Seok Girlie ty eee Tot Saseh crones th bed of the stream in a line 
with the trap ridge at Mt. Carmel; this ledge prevented excavation. 
