ICE-RETREAT IN GLACIAL LAKE N ETON SET 197 



only by careful field work, though the facts now at hand seem to 

 indicate that the mode of retreat discussed in the present paper is the 

 most common. 



Conditions in southeastern Massachusetts.— A study of the numer- 

 ous, and often very large, kettle depressions in the stratified drift 

 plains south of Middleboro, and at various other points in Plymouth 

 county in southeastern Massachusetts, shows that throughout large 

 areas in this part of the state extensive masses of stagnant ice existed 

 during the final disappearance of the ice. How broad a belt of such 

 ice existed at any one time or place cannot be readily determined, 

 but in general the belt of no motion was probably not over ten or 

 twenty miles in width, as more or less indefinite morainal bands 

 indicating active ice-movements are found at intervals across the area, 

 while occasionally more pronounced deposits occur. 



M. L. Fuller. 



U. S. Geological Survey, 

 Washington, D. C. 



