RATE OF RECESSION 77 



Probable Oscillations of the Ice Border in the 

 Amherst-Northampton Region 



In November, 1921, there was, at locality 24, southeast of 

 Amherst, an excellent long vertical section, part of which is 

 shown in Figure 15. The sequence of strata is clear on the left 

 side of the section. The thicknesses are as follows, beginning 

 at the top : 



2K feet till. 



2% feet crumpled clay, about 150 varves. 



10 feet excellent clay, varves 4450-4668. 



1% feet till. 



More than \% feet quicksand. 



To the right, the whole clay bed is crumbled down to the till. 

 The pressure which folded the clay seems to have come from 

 the west-northwest. The connection between the covering till 

 and the folding of the clay is evident, but the circumstances 

 under which the till was deposited are not clear. Those small 



,.,, AAA A A A A A A A A A A A A A A 

 Till A A A A A A A A A A A A A A A A A 

 AAAAAAAAAAAAAAAA 



Varve 

 Clay' 



TM| AZ^AAAAAAAAAAAAAA 

 ' ." AAAAAAAAAAAAAAA 



Sand -^^^==sr==^r====zL^=zjrTi^=r^^-=^7=^====j=-z=-- 



Fig. 15 — Section at locality 24, southeast of Amherst, Mass., showing till on top 

 of the varve clay and partial folding of the clay by pressure from the west-northwest. 



