256 SOME EFFECTS OF ICE ACTION NEAR 



Salisbury, in his Glacial Geology of New Jersey, p. 98, 

 makes mention of Endmoranes or Geschiebewalls. They have 

 originated through marg'nal masses of ice becoming separated 

 from the main body during a retreat, probably the final one, 

 of the ice. Here we have a debris loaded iceberg melting 

 where it stands and showering down around it gravel and 

 boulders. These, heaped up in a ridge more or less circular in 

 form, serve as a retaining wall for the water of the lake left 

 at the final melting of the ice. 



Or if this ice mass, instead of being entirely separated from 

 the main body, projected as a lobe, we would again have con- 

 ditions to form such a wall. If the lobe kept melting back as 

 fast as it was pushed forward, its load would be discharged in 

 a continuous line along a stationary front. Naturally where 

 the lobe united with the main body of the ice, we would expect 

 to find the wall missing. 



I greatly regret that I was compelled to leave my investiga- 

 tions before completing the survey of the upper end of the lake, 

 from which direction the glacial movement took place. 



