ESKERS IN THE VICINITY OF ROCHESTER, NEW YORK. 



199 



(4) If eskers were formed in re-entrants in the ice front, such 

 re-entrants would have to maintain their position while the ice front 

 was receding for 100 miles or more in the case of the longer eskers, 

 such as those of Maine, a condition not likely to occur. 



(5) If eskers had been deposited in re-entrants into the ice 

 their sides would be expected to show evidences of erosion in many 

 cases by the stream which contributed to their formation. Eskers 

 do not generally exhibit such erosional features, even on steep down 

 slopes. 



(6) Eskers occur where it would be impossible for a re-entrant 

 to exist, situations in which the ice is wedged against a high cliff, 

 the pressure on which would close the re-entrant (122). 



Fig. 4. Outline map, showing the eskers of Finland, trending south-easterly 

 toward the terminal moraines that were built at the margin of the ice. 

 The segmented character of eskers and the intimate relations they display 

 to terminal moraines are excellently displayed (After J. J. Sederholm). 



