MARGINAL GLACIAL DRAINAGE FEATURES 



531 



which is distinctly within the main channel, but shows no trace of 

 stream action. Beyond the divide a hummocky deposit continues 

 nearly to the small stream which here crosses nearly at right angles 

 to the direction of the channel. In this stream, approximately in line 

 with the west channel wall, is a waterfall probably formed by the 



YiG. 2. — ^Wedgwood and Watkins Hill channels. These channels were formed 

 at the margin of an ice-lobe moving southward through the Seneca Lake valley shown 

 on the eastern side of the map. Scale 1/62,500. 



present stream encountering the rock wall of the buried gorge. A 

 short distance below the fall the conditions shown in A-B (Fig. 3) 

 may be seen. There is a rock terrace about thirty feet wide at a level 

 three feet above the present stream. The stream, however, is not 

 flowing on rock. It seems to have discovered a buried channel, for 

 both its bottom and its southwestern side are composed of drift. 



