66 ICE RECESSION IN NEW ENGLAND 



were correct, as is proved by their agreement with several other 

 profiles (see PI. I). The correspondence of the two graphs is 

 excellent. 



Localities 15, 18, and 24 lie at the following distances from 

 each other: 15 and 18, 3.7 miles (6 km.), 15 and 24, 8.3 miles 

 (13.5 km.); 18 and 24, 9.7 miles (15.7 km.). Localities 18 and 

 24 are situated in the same glacial lake, though on different 

 sides of it, and locality 15 in a lake separated from the former by 

 the Holyoke Range, except for one or two narrow gaps (Fig. 6). 

 Since most of the material coming from the melting land ice was 

 deposited in the nearer, or Northampton, lake, the varves at 

 localities 18 and 24 are thicker than those at locality 15. Varves 

 4551 and 4552, at locality 24, mark an inconsiderable drainage 

 not felt outside the bay southeast of Amherst. The curves with 

 two exceptions are reproduced exactly as measured in the field. 

 At locality 15 the varves 4553 and 4554 were incorrectly meas- 

 ured as one, and at 18 varve 4531 was divided in two. In the 

 first case, the supposed varve has been divided so as to match 

 those at the other localities, and in the latter case the two varves 

 have been united. These varves have been marked by dotted 

 lines. Considering the different position of the localities in rela- 

 tion to the ice border, the agreement among the three curves is 

 remarkable. 



The third group comprises localities 82, 90, and 91. The dis- 

 tance from 82 to 90 is 8.4 miles (14.5 km.) ; from 90 to 91, 3 miles 

 (4.8 km.). All three lie in the same glacial lake, but locality 91 

 in a narrow branch now constituting the Passumpsic valley, 

 locality 90 in the same branch less than a mile north of its junc- 

 tion with the Connecticut, and 82 farther south in the lake (Fig. 

 12). Varves 7200 and 7201 are sandy and silty and mark a 

 drainage. Since they are much thinner at locality 91 than at 

 the two other points, the drainage evidently came into the 

 Connecticut above its junction with the Passumpsic. The graphs 

 show the original measurements unchanged, except for two 

 cases in curve 82, which have been marked by dotted lines. 

 Varves 71 16 and 71 17 had been incorrectly measured as one, 



