J. D. Dana—The overflows of the flooded Connecticut. 501 
ampton, we learn that not less than 1200 feet of rock in 
depth has been removed from the sandstone formation of that 
part of the valley since the Jurassic period, of which a large 
part was probably the work of the Glacial era; and, on the 
same kind of evidence, that the removal near New Haven has 
exceeded 800 feet. 
IL Tax Connecricur VatiEy purine THE GiactaL Froop. 
Bay was restored in part to its old rights by overflows giving 
3 | es are— 
First, over the Meriden divide, as has been already ex- 
plained. 
Second, at Westfield, west of Springfield, whence the waters 
descended along the western section of the valley, and finally 
joined Quinnipiac and Mill Rivers—New Haven streams. 
Third, from the Northampton region, by the valley west of 
Mount Tom, over the Weatfeld divide to Westfield, there to 
join the Westfield overflow. 
As to other westward overflows to the north I do not speak, 
as I have made there no special examinations. 
The fact and the features of the western section of the val- 
