68 ICE RECESSION IN NEW ENGLAND 



ments made in probably different lakes (cf. p. 59) in the Con- 

 necticut Valley 50 miles (80 km.) apart. Since the lower lake 

 was supplied with masses of material from its side valleys, 

 principally from the White River valley, the varves at the 

 southern locality, number 63, are three or four times as thick 

 as those in the Woodsville region. Taking this peculiarity into 

 account, the correspondence between the curves is good. 



Sure connections have accordingly been found across New 

 England between points at distances up to no miles (175 km.) — ■ 

 the most widely separated measurements of the same horizons 

 that have been made. This shows that the essentials for getting 

 connections are selection of fine and undisturbed series and 

 accuracy in measurement. Then correct connections can be 

 found irrespective of the distances, so long as we keep within an 

 area which was climatologically uniform during the ice retreat, 

 and provided also the local conditions were not extreme. 



