76 ICE RECESSION IN NEW ENGLAND 



Table I — Rate of Retreat of the Ice Border — Continued 







Time of Re- 



Rate of 



Localities 



Distance 



treat in 



Retreat a 







Years 



Year 



6 i to 64 



15. Smiles =81, 840 feet 



133 



615 feet 



Both with bottom 



25 km. 





188 m. 



64 to 67 



4 miles =21,120 feet 



<26 



>8i2 feet 



67 practically with 



6.4 km. 





>246 m. 



bottom 









67 to 70 



21 miles = 110,880 feet 



>I4I 



<786 feet 



Both practically 



33-8 km. 





<240 m. 



with bottom 









70 to 71 



y 2 mile = 2,640 feet 



3 



880 feet 



71 with bottom 



0.8 km. 





268 m. 



70 to 75 



6 miles = 31,680 feet 



29 



1092 feet 



75 with bottom 



9.7 km. 





333 m. 



75 to 79 



5 miles = 26,400 feet 



24 



1 1 00 feet 



Both with bottom 



8 km. 





335 m. 



79 to 86 



11 miles =58, 080 feet 



About 70 



830 feet 



86 practically with 



17.7 km. 





253 m. 



bottom 









Rate of Recession in the Southern Zone 



In the southernmost zone, between Hartford and Springfield, 

 the recession was consequently rather fast, amounting to about 

 243 feet (74 m.) a year. In Massachusetts the rate decreased 

 considerably, averaging between Springfield and Greenfield only 

 116 feet (35 m.) annually. The recession, however, seems to 

 have varied greatly in speed in different zones and even to have 

 been interrupted by readvances. Between localities 7 and 24 the 

 retreat was less than 100 feet (31 m.) a year. 



