io ICE RECESSION IN NEW ENGLAND 



the lakes were filled up with sediments, which required a consid- 

 erable length of time, since most of them were very deep. The 

 lake at Woodsville, N. H., lasted more than i,6co years, as 

 recorded by the very thin varves at locality 73. 



As northern New England rose and the southern part sank, 

 and as the rivers cut down the barriers at the southern ends 

 of the lakes, the remnants of them were drained. While the 

 warping of the land proceeded, the rivers began to cut through 

 the lake beds and to expose the sediments. These sections of 

 varve clav are the records studied. 



